Impostor Professor OakBase Set 73/102 price & value
Printing: UnlimitedOther printings: 1st Edition $49.99 ungraded, Shadowless $12.99 ungraded
$7.71
up +15%4 weeks · Rising
Medium confidence
Medium confidence
How closely the price sources agree, and how often the card trades.
- 11 ungraded in the last 90 days, all conditions
- Fewer than 5 sales listed as near mint
- Last sale Nov 8, 2026
High liquidity67/100
High liquidity
Trades often, at prices that agree. It counts sales, not how long a listing takes to sell.
About 4 ungraded copies sell a month across all conditions, the pace of the last 90 days.
How we measure liquidity →Near mint · UltraBall Market Value · 11 ungraded sales in the last 90 days, all conditions · as of Nov 12, 2026
Graded: PSA 9 $77.42PSA 10 $331
eBay links on this page are affiliate links: we earn a commission if you buy, at no extra cost to you. It never changes our prices or which listings we show.
Prices updated Nov 12, 2026 · How we calculate the UltraBall Market Value
People ask about this card
- What does Base Set cost to complete?
- As of Nov 12, 2026, Base Set costs about $1,953 ungraded (102 of 102 cards priced). Base Set cost to complete.
- Which printing of Impostor Professor Oak 73/102 is this, and why do two copies differ in price?
- Impostor Professor Oak 73/102 comes in 3 printings: Unlimited $7.71 ungraded, 1st Edition $49.99 ungraded, Shadowless $12.99 ungraded. 1st Edition, Shadowless or Unlimited: look for the black “Edition 1” stamp first. Without it, no drop shadow down the right of the picture box means Shadowless; a shadow means Unlimited. Printings compared.
- What is Impostor Professor Oak 73/102 worth raw, in PSA 9 and in PSA 10?
- As of Nov 12, 2026, Impostor Professor Oak 73/102 is about $7.71 ungraded near mint (11 sales in 90 days); PSA 9 about $77.42; PSA 10 about $331. Every grade’s price.
- Is Impostor Professor Oak 73/102 worth grading?
- As of Nov 12, 2026, against $7.71 raw, a PSA 10 sells for about $331 and, after PSA’s Standard fee ($59.99), shipping and selling fees, leaves about $196 more than selling raw; a PSA 9 sells for about $77.42 and, after PSA’s Standard fee ($59.99), shipping and selling fees, leaves about $24.62 less than selling raw. +14% of the copies PSA has graded came back a 10. Grading calculator.
Impostor Professor Oak 73/102 price over time
- Recorded prices, joined day to day
- Estimated: no price recorded for more than 14 days
Ungraded, 1 year: $6.91 on Nov 11, 2025, $7.71 on Nov 12, 2026. Lowest $4.21, highest $7.71.
- Now
- $7.71
- 4 weeks
- +15%
- 90 days
- +66%
- 1 year
- +11%
- Highest, 1Y
- $7.71
- Lowest, 1Y
- $4.21
Recorded history starts January 2021. Earlier history is monthly averages; from August 29, 2026 the line is a smoothed 7-day average of daily prices, so single-day swings don’t show. Between recorded prices, the line and its daily values are estimated from the prices either side; it is dashed where no price was recorded for more than 14 days.
Impostor Professor Oak 73/102 price by month
Ungraded, at the end of each month, newest first: the line above read off at each month’s last day. The latest month ends on today’s UltraBall Market Value.
| Month | Ungraded | Change on month |
|---|---|---|
| November 2026to Nov 12, 2026 | $7.71 | up +16% |
| October 2026 | $6.65 | up +5.7% |
| September 2026 | $6.29 | up +36% |
| August 2026 | $4.62 | – |
| July 2026 | $4.21 | down −19% |
| June 2026 | $5.22 | down −16% |
| May 2026 | $6.23 | up +24% |
| April 2026 | $5.04 | down −11% |
| March 2026 | $5.69 | up +0.4% |
| February 2026 | $5.66 | 0.0% |
| January 2026 | $5.66 | down −5.8% |
| December 2025 | $6.02 | down −13% |
Recent verified sales
RawPokemon Card - Impostor Professor Oak - Base Set - 73/102 - Near mintNov 8, 2026 · 
eBay · Sold as near mint · Auction · View listing · $8.02- RawImpostor Professor Oak Base Set 73/102 Rare Unlimited Pokémon - MP (Very Good)Nov 5, 2026 · eBay · Sold as moderate play · View listing · $6.43
RawWizards of the Coast Impostor Professor Oak 73/102 Rare Unlimited 1999 ENNov 4, 2026 · eBay · Sold as heavy play · Offers taken (asking price; paid may be lower) · View listing · Asking price, up to $2.99asking
RawImpostor Professor Oak Trainer Base Set 2 Unlimited 73/102 1999 RareUnusual priceNov 3, 2026 · eBay · Sold as light play · Auction · View listing · $2.25
RawPokemon TCG - Impostor Professor Oak 73/102 Base Set Rare WOTC - EXC - CreaseOct 24, 2026 · eBay · Sold as damaged · Auction · View listing · $2.99
RawPokemon Impostor Professor Oak 73/102 Base Set Vintage Trainer 1999 (B)Oct 21, 2026 · eBay · Sold as moderate play · Offers taken (asking price; paid may be lower) · View listing · Asking price, up to $6.00asking
RawImpostor Professor Oak 73/102 Rare Base Set Pokemon Unlimited DamagedOct 6, 2026 · eBay · Sold as damaged · Buy It Now · View listing · $4.00- RawPokémon TCG Impostor Professor Oak Base Set 73/102 1999-2000 Base Set 4th printOct 5, 2026 · eBay · Sold as light play · View listing · $12.87
PSA 8Pokémon TCG Impostor Professor Oak 73/102 Base Set Rare Regular EN 1999 PSA 8Sep 12, 2026 · eBay · Auction · View listing · $20.00- PSA 10Pop 10 PSA 10 Impostor Professor Oak 4th Print 1999 Pokemon Base Set 73/102Feb 3, 2026 · eBay · View listing · $389
Graded values
Impostor Professor Oak 73/102 price by grade
| Grade | Market value | 4 wk | Sales/moSales a month | Last sale |
|---|---|---|---|---|
| UngradedHigh. How closely the price sources agree, and how often the card trades. | $7.71Last $8.02 · Nov 8, 2026 | up +15% | 4High liquidity. High | $8.02Nov 8, 2026High. How closely the price sources agree, and how often the card trades. |
| PSA 1043× rawLimited. How closely the price sources agree, and how often the card trades. | $331Last $389 · Feb 3, 2026 | up +3.4% | No recent sales | $389Feb 3, 2026Limited. How closely the price sources agree, and how often the card trades. |
| PSA 910× rawLimited. How closely the price sources agree, and how often the card trades. | $77.42 | up +20% volatile | No recent sales | –Limited. How closely the price sources agree, and how often the card trades. |
| PSA 84.2× rawLimited. How closely the price sources agree, and how often the card trades. | $32.33Last $20.00 · Sep 12, 2026 | down −3.3% | 0.3Low liquidity. Low | $20.00Sep 12, 2026Limited. How closely the price sources agree, and how often the card trades. |
| PSA 73.4× rawLimited. How closely the price sources agree, and how often the card trades. | $26.00 | up +1.7% | No recent sales | –Limited. How closely the price sources agree, and how often the card trades. |
| BGS 1055.9× rawLimited. How closely the price sources agree, and how often the card trades. | $431 | – | No recent sales | –Limited. How closely the price sources agree, and how often the card trades. |
Each graded row counts only that grade's sales; the ungraded row counts every condition. Sales a month is the 90-day pace. Last sale is the latest verified sale, never an asking price. How we calculate the UltraBall Market Value
Grade it with PSA?
Grade yours from photos →Change the costs, or add your own odds →- If it gets a PSA 10
- +$196
- If it gets a PSA 9
- −$24.62
- PSA fee for a PSA 10
- $59.99 Standard
- Slab sale price to break even
- $106at Standard, $59.99
- Grading pays, at today’s prices
- PSA 10 only
- Historical PSA 10 rate
- 14%
Against selling raw at $7.71, after the PSA fee for what the slab is worth (a 10 goes in at Standard, $59.99; a 9 at the same level), $25.00 shipping and insurance, and eBay US selling fees, as the selling calculator works them out, with its usual $5 postage and $1 packing on each sale: the same sum as the selling calculator. Each grade is charged the fee level its own slab price needs, so the break-even price carries the fee for a slab at that price, not the PSA 10 fee. These are outcomes if the card gets each grade, not the chance that it will. PSA has graded 1,163 copies; 167 got a 10.
Population
- PSA graded
- 1,163
- +4 Sep 28, 2026 – Nov 9, 2026
- PSA 10
- 167
- −2 Sep 28, 2026 – Nov 9, 2026
- PSA 9
- 554
- +1 Sep 28, 2026 – Nov 9, 2026
- Historical PSA 10 rate
- 14%
- PSA 10s of all graded
A higher historical PSA 10 rate than 18% of the Base Set cards PSA has graded enough of.
| Grader | Graded | 10s | 9s | 10s share |
|---|---|---|---|---|
| PSA | 1,163 | 167 | 554 | 14% |
| CGC | 182 | 9 | 37 | 4.9% |
| BGS | 23 | 0 | 10 | 0.00% |
- PSA graded
- 1,163
- 10s
- 167
- 10s share
- 14%
- Historical PSA 10 rate
- 14%
Every PSA grade (11)
| Grade | Copies | Share |
|---|---|---|
| 10 | 167 | 14% |
| 9 | 554 | 48% |
| 8.5 | 3 | 0.26% |
| 8 | 212 | 18% |
| 7 | 100 | 8.6% |
| 6 | 62 | 5.3% |
| 5 | 48 | 4.1% |
| 4 | 11 | 0.94% |
| 3 | 2 | 0.17% |
| 2 | 3 | 0.26% |
| 1 | 4 | 0.34% |
PSA’s count of Nov 10, 2026. The rate is PSA 10s over every copy PSA has graded.
- CGC graded
- 182
- 10s
- 9
- 10s share
- 4.9%
- Historical CGC gem rate
- 4.9%
- Gem: 10s, Pristine and Perfect 10s
Every CGC grade (14)
| Grade | Copies | Share |
|---|---|---|
| 10 | 9 | 4.9% |
| 9.5 | 7 | 3.8% |
| 9 | 37 | 20% |
| 8.5 | 52 | 29% |
| 8 | 16 | 8.8% |
| 7.5 | 22 | 12% |
| 7 | 10 | 5.5% |
| 6.5 | 7 | 3.8% |
| 6 | 6 | 3.3% |
| 5.5 | 4 | 2.2% |
| 5 | 6 | 3.3% |
| 4.5 | 2 | 1.1% |
| 4 | 2 | 1.1% |
| Authentic | 2 | 1.1% |
CGC’s count of Nov 10, 2026. 10s share counts every 10 label; CGC’s own gem is 10s, Pristine and Perfect 10s.
- Beckett graded
- 23
- 10s
- 0
- 10s share
- 0%
- Historical Beckett gem rate
- 13%
- Gem: 9.5s, Pristine and Black Label 10s
Every Beckett grade (7)
| Grade | Copies | Share |
|---|---|---|
| 9.5 | 3 | 13% |
| 9 | 10 | 43% |
| 8.5 | 6 | 26% |
| 8 | 1 | 4.3% |
| 6 | 1 | 4.3% |
| 5 | 1 | 4.3% |
| 3.5 | 1 | 4.3% |
Beckett’s count of Nov 10, 2026. 10s share counts every 10 label; Beckett’s own gem is 9.5s, Pristine and Black Label 10s.
PSA’s count of Nov 10, 2026; the changes are PSA’s weekly report from Sep 28, 2026 to Nov 9, 2026. CGC, BGS and SGC as of Nov 10, 2026; their 10s include Pristine, Perfect and Black Label 10s. PSA counts the cards it has graded, not every copy that exists. Compare with the low pop cards and the hardest PSA 10s.
PSA 10 price against PSA’s population
The same 13 weeks, Jul 24, 2026 to Nov 9, 2026: the price on the day of each weekly PSA report, and the report’s counts. Side by side, not cause and effect.
Left: PSA 10 price, US$. Right: PSA graded copies.
About this card
This page prices the Unlimited print. A 1st Edition Impostor Professor Oak sells for about $49.99 ungraded. A Shadowless Impostor Professor Oak sells for about $12.99 ungraded.
Impostor Professor Oak is card 73 of 102 in the Base Set price guide, a set released in January 1999 during the Wizards of the Coast era. Its rarity is Rare. The artwork is by Ken Sugimori. In the checklist it sits after Devolution Spray 72/102 and before Item Finder 74/102.
It is the 26th most valuable of the 102 priced cards in Base Set, behind Charizard 4/102 (see the most valuable Base Set cards).
What the data says
The ungraded value is up 15% over four weeks on 7-day averages, with 6 ungraded sales in the last 30 days.
A PSA 10 is valued at 43× the ungraded price ($331 against $7.71), and a PSA 9 at $77.42.
PSA has graded 1,163 copies, 167 of them PSA 10 (14%). That describes the copies sent in, not the chance a given card grades 10.
From prices of Nov 12, 2026 and sales to Nov 8, 2026. Observations, not advice or a forecast. How we read the market
Market snapshot
How each figure is worked out- 4 weeks
- +15%ungraded, between 7-day averages
- 90 days
- +66%ungraded; before Aug 29, 2026 from monthly averages
- 1 year
- +11%ungraded; before Aug 29, 2026 from monthly averages
- Direction
- Risingthe ungraded 7-day average is up 10% or more on four weeks ago
- High since daily tracking
- At the high$7.68 on Nov 12, 2026, 7-day average; daily prices since Aug 29, 2026
- Liquidity
- High3.7 ungraded sales a month over 90 days
- Price confidence
- Medium confidenceSome recent sales, or sales that vary more than usual.
- Ungraded sold
- 6in 30 days; 11 in 90
- PSA 10 premium
- 43×the ungraded price; the typical Base Set card with a PSA 10 price: 44.5×
- PSA 10 population
- 167of 1,163 PSA graded, count of Nov 10, 2026
- Population change
- +4graded, -2 PSA 10s, Sep 28, 2026 to Nov 9, 2026
No money needed: buy it with virtual UltraCash in the fantasy game, or call today’s card.
Printings compared
- Unlimited · this pageNo 1st Edition stamp, and a drop shadow down the right-hand edge of the art box. This is the common print.$7.71 ungraded
- 1st EditionA black “Edition 1” stamp to the lower left of the art box.$49.99 ungraded
- ShadowlessBase Set only. No drop shadow on the right of the art box, thinner HP text, and no 1st Edition stamp.$12.99 ungraded
- 1st Edition, Shadowless or Unlimited: look for the black “Edition 1” stamp first. Without it, no drop shadow down the right of the picture box means Shadowless; a shadow means Unlimited.
- Set
- Base Set
- Number
- 73/102
- Set code
- BS
- Rarity
- Rare
- Released
- Jan 9, 1999
- Illustrator
- Ken Sugimori
- Printings
- Unlimited, 1st Edition, Shadowless
- Base Set checklistAll 102 cards with prices
- Most valuable Base Set cardsRanked by ungraded value
- Base Set chase cardsThe pulls collectors open packs for, with odds where we hold them
- 1st Edition vs Shadowless vs UnlimitedHow to tell the printings apart and what each is worth
- Wizards of the Coast eraSets and chase cards from January 1999 on
- 1999 Pokémon cardsEvery set released in 1999, with prices
Cite this price
Impostor Professor Oak 73/102 (Base Set) is worth $7.71 ungraded as of Nov 12, 2026, according to UltraBall's Market Value (https://ultraball.com/cards/base-set/impostor-professor-oak-73).
Impostor Professor Oak 73/102 (Base Set) is worth $7.71 ungraded as of Nov 12, 2026, according to UltraBall's Market Value (https://ultraball.com/cards/base-set/impostor-professor-oak-73).
https://ultraball.com/cards/base-set/impostor-professor-oak-73
<a href="https://ultraball.com/cards/base-set/impostor-professor-oak-73">Impostor Professor Oak 73/102 (Base Set) price: $7.71 on UltraBall</a>
Nearby in Base Set
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Questions collectors ask
As of Nov 12, 2026, Impostor Professor Oak 73/102 Base Set is worth about $7.71 ungraded. A PSA 10 copy is worth about $331. How we price cards.