Base Set#51PSA 10 Gem Mint
Koffing Base Set Unlimited PSA 10 Price History
Live PSA 10 Gem Mint price tracking for the 1999 Pokemon Base Set Koffing (#51). Data compiled from verified sold listings on eBay, Goldin, and Fanatics Collect.
Current PSA 10 Market Avg
$95
+55.1% over the last 12 monthsCompare Koffing Variants
Koffing was printed across multiple Base Set variants. Click any variant above to view its price history.
All-Time High
$98
Apr 2026
All-Time Low
$3
Feb 2021
Since Feb 2021
+3539.8%
total return
Avg Monthly Price
$51
64 months tracked
Recent Sales Avg
$75
28 listings tracked
Recent Sales Range
$40–$115
low to high
PSA 10 Monthly Price History
Monthly average PSA 10 Gem Mint price for the 1999 Pokemon Base Set Koffing (#51). Data covers Feb 2021 – May 2026.
Recent Gem Mint Sales
| Date Sold | Price | Grade | Source | Listing |
|---|---|---|---|---|
| 2026-05-12 | $20 | CGC 10 | eBay | Pokémon Koffing Base Set 1999 51/102 CGC Gem Mint 10 English Common 051/102 |
| 2026-05-03 | $31 | CGC 10 | eBay | Pokemon TCG – Koffing – 51/102 – Base Set – Unlimited CGC 10 51/102 |
| 2026-04-17 | $115 | PSA 10 | eBay | 1999 Pokemon Base Set Unlimited #51 Koffing Gem Mt PSA 10 #51 |
| 2026-03-30 | $92 | PSA 10 | eBay | 1999 POKEMON BASE SET UNLIMITED #51 KOFFING PSA 10 #51 |
| 2026-03-30 | $91 | PSA 10 | eBay | Pokemon Koffing Base Set Unlimited #51 PSA 10 Gem Mint |
| 2026-03-14 | $100 | PSA 10 | eBay | Koffing 51/102 Base Set (Unlimited) Pokemon Card PSA 10 #PSA CGC BGS |
| 2026-03-07 | $100 | PSA 10 | eBay | Pokémon Koffing Base Set #51 1999 PSA 10 GEM MT Regular English 051/102 |
| 2026-02-27 | $126 | CGC 10 Pristine | eBay | Pokemon Base Set Koffing Unlimited CGC Pristine 10 51/102 |
| 2026-02-03 | $35 | CGC 10 | eBay | Koffing 51/102 Base Set Pokemon CGC 10 Gem Mint 51/102 |
| 2026-01-25 | $255 | CGC 10 Pristine | eBay | Cert # Ends 42069 1999 Pokemon Base Set Koffing Unlimited CGC Pristine 10 Rare 51/102 |
| 2026-01-19 | $98 | PSA 10 | eBay | Koffing 51/102 Base Set (Unlimited) Pokemon Card PSA 10 #PSA CGC BGS |
| 2025-12-29 | $24 | CGC 10 | eBay | 1999 Pokémon Base Set Koffing #51/102 – CGC 10 Gem Mint – Vintage WOTC 51/102 |
| 2025-12-07 | $66 | PSA 10 | eBay | KOFFING #51 PSA 10 1999 POKEMON Base Set Unlimited WOTC #51 |
| 2025-12-04 | $26 | CGC 10 | eBay | 1999 Pokemon Base Set #51/102 Koffing CGC 10 GEM MINT |
| 2025-11-22 | $100 | PSA 10 | eBay | Pokemon Koffing Base Set Unlimited #51 PSA 10 Gem Mint |
| 2025-11-17 | $86 | PSA 10 | eBay | KOFFING #51 PSA 10 1999 POKEMON Base Set Unlimited WOTC |
| 2025-11-05 | $10 | CGC 10 | eBay | 1999 Pokémon Base Set Koffing 051/102 CGC 10 Gem Mint 051/102 |
| 2025-10-27 | $50 | CGC 10 | eBay | 1999 Pokémon Base Set Koffing 051/102 CGC 10 Gem Mint 051/102 |
| 2025-10-17 | $72 | PSA 10 | eBay | 1999 Pokemon Game Base Set Koffing #51, PSA Grade 10 Gem Mint #51 |
| 2025-10-05 | $28 | CGC 10 | eBay | 1999 Pokemon Base Set Koffing 51/102 Unlimited Non-Holo Common CGC 10 |
| 2025-09-16 | $44 | PSA 10 | eBay | 1999 Pokemon Base Set Koffing 51/102 PSA 10 Gem Mint Rare Card Wotc Vintage |
| 2025-08-25 | $85 | PSA 10 | eBay | 1999 Pokemon Koffing #51 Base Set Unlimited English 51/102 PSA 10 GEM MINT #51 |
| 2025-08-18 | $44 | PSA 10 | eBay | 1999 POKEMON GAME BASE SET 51 KOFFING PSA 10 GEM MINT #51 |
| 2025-08-16 | $70 | PSA 10 | eBay | Koffing Pokemon 1999 PSA Gem Mint 10 Base Set 051/102 |
| 2025-08-03 | $84 | PSA 10 | eBay | Pokemon 1999 Base Set Unlimited Koffing 51/102 PSA 10 |
| 2025-07-29 | $84 | PSA 10 | eBay | 1999 POKEMON GAME BASE SET 51 KOFFING PSA 10 GEM MINT #51 |
| 2025-07-13 | $80 | PSA 10 | eBay | 1999 Koffing Base Set Unlimited Pokemon PSA 10 Gem Mint #51 |
| 2025-06-17 | $43 | CGC 10 Pristine | eBay | Pokemon 1999 BASE SET Koffing CGC PRISTINE 10! 51/102 |
| 2025-06-15 | $51 | CGC 10 Pristine | eBay | 1999 Pokémon Base Set Koffing 51/102 CGC PRISTINE 10 051/102 |
| 2025-06-08 | $65 | PSA 10 | eBay | Pokemon Koffing Base Set Unlimited #51 PSA 10 Gem Mint |
| 2025-06-05 | $30 | CGC 10 | eBay | Koffing – CGC 10 Gem Mint Graded – 1999 Base Set 51/102 Gas Pokemon Card 51/102 |
| 2025-05-30 | $25 | CGC 10 | eBay | 1999 Pokemon Base Set Koffing 51/102 Unlimited Non-Holo Common CGC 10 51/102 |
| 2025-05-05 | $20 | CGC 10 | eBay | Graded CGC 10 Pokémon TCG Koffing Base Set 51/102 Unlimited Common (1999) 051/102 |
| 2025-04-09 | $65 | PSA 10 | eBay | Pokemon Koffing Base Set Unlimited #51 PSA 10 Gem Mint |
| 2025-04-08 | $41 | CGC 10 | eBay | 1999 Pokemon Base Set Koffing 51/102 Unlimited Non-Holo Common CGC 10 51/102 |
| 2025-03-30 | $51 | PSA 10 | eBay | Pokemon Koffing Base Set Unlimited #51 PSA 10 Gem Mint |
| 2025-03-28 | $27 | CGC 10 | eBay | 1999 Pokemon Base Set Koffing 51/102 Unlimited Non-Holo Common CGC 10 |
| 2025-03-21 | $20 | CGC 10 | eBay | 1999 Koffing 051/102 Pokemon Base Set Regular CGC 10 GEM MINT 051/102 |
| 2025-03-14 | $90 | CGC 10 | eBay | CGC 10 KOFFING POKEMON (1999) BASE SET #51/102 GEM MINT 51/102 |
| 2025-02-24 | $63 | PSA 10 | eBay | Koffing 51/102 Base Set 1999 Unlimited Pokemon PSA 10 GEM MINT |
| 2025-02-23 | $53 | PSA 10 | eBay | Pokemon Koffing Base Set Unlimited #51 PSA 10 Gem Mint |
| 2025-02-11 | $28 | CGC 10 | eBay | CGC 10 GEM MINT Koffing Base Set 51/102 Pokemon Card 51/102 |
| 2025-01-16 | $90 | PSA 10 | eBay | 1999 POKEMON GAME #51 KOFFING PSA 10 GEM MINT BASE SET #64 |
| 2025-01-14 | $73 | PSA 10 | eBay | Koffing 51/102 Base Set 1999 Unlimited Pokemon PSA 10 GEM MINT |
| 2025-01-04 | $74 | PSA 10 | Wizards Of The Coast | Pokemon Base Set Card #51 Koffing PSA 10 [eBay] |
| 2025-01-04 | $28 | CGC 10 | eBay | Koffing Pokemon (1999) Base Set #51/102 CGC 10 GEM MINT 51/102 |
| 2024-12-21 | $40 | PSA 10 | eBay | Koffing 51/102 Pokemon Base Set PSA 10 GEM MINT 51/102 |
| 2024-11-15 | $63 | PSA 10 | eBay | 1999 Pokémon Base Set Unlimited – Koffing – PSA 10 GEM MINT |
| 2024-10-30 | $40 | PSA 10 | eBay | 1999 POKEMON GAME 51 KOFFING PSA 10 GEM MINT 1999-2000 BASE SET |
| 2024-10-01 | $27 | CGC 10 | eBay | 1999 Pokemon Base Set Koffing 51/102 Unlimited CGC Gem Mint 10 51/102 |
| 2024-09-29 | $28 | CGC 10 | eBay | Koffing 51/102 Unlimited – CGC Gem Mint 10 – Base Set – Pokemon TCG 1999 51/102 |
| 2024-05-10 | $8 | CGC 10 | eBay | Pokémon TCG Koffing Base Set 51/102 Regular Unlimited CGC GEM MINT 10 !!! 51/102 |
| 2024-05-03 | $45 | CGC 10 Pristine | eBay | 1999 Pokemon TCG Base Set Koffing #51 CGC Pristine 10 #51 |
| 2024-05-03 | $43 | CGC 10 Pristine | eBay | 1999 Pokemon Base Set #51 Koffing CGC 10 PRISTINE |
| 2024-04-26 | $37 | CGC 10 | eBay | 1999 Pokemon TCG Base Set Koffing #51 CGC Gem Mint 10 #51 |
| 2024-04-20 | $13 | CGC 10 | eBay | Pokémon TCG Koffing Base Set 51/102 Regular Unlimited Common 51/102 |
| 2024-04-19 | $14 | CGC 10 | eBay | Pokemon CGC Graded Gem Mint 10 Base Set Koffing 51/102 (1999) 51/102 |
| 2024-03-07 | $12 | CGC 10 | eBay | Pokemon Koffing Base Set 51/102 CGC Gem Mint 10 Unlimited Psa 51/102 |
58 verified gem-mint sales (PSA 10, CGC 10, BGS 10, and other 10-grade equivalents). PSA 10 carries the highest premium; CGC 10 and BGS 10 typically trade at a slight discount. Prices exclude shipping.
About Koffing (Base Set Unlimited)
Basic Grass/Poison. Foul Gas attack causes Confusion or Poison — pre-evolution of Weezing.
The Unlimited print is the most common Base Set variant. Drop-shadow border on the right and bottom edges of the artwork, no edition stamp. Printed continuously from 1999 through early 2000.
How to identify a Unlimited Koffing:
- Drop-shadow visible on the right and bottom edge of the artwork box
- No “Edition 1” stamp on the lower-left
- WotC copyright at the bottom
- 1999 copyright date
Related Pages
FAQ
- How much is a PSA 10 Koffing Base Set Unlimited worth?
- As of May 2026, the monthly average sold price is $95. Individual sales over the last several months ranged from $40 to $115. Prices are volatile — check the chart above for the latest trajectory.
- How do I tell if my Koffing is a Unlimited?
- Look for the markers listed in the identification section above. The key distinguishing features for the Unlimited variant are: drop-shadow visible on the right and bottom edge of the artwork box, no “edition 1” stamp on the lower-left.
- Where does this price data come from?
- All chart data and recent sales are compiled from verified sold listings across eBay, TCGPlayer, Goldin, and Fanatics Collect. Last refreshed 2026-05-24.
Price data compiled from verified sold listings across major marketplaces and auction houses. Last updated 2026-05-24. This page is informational only and is not investment advice. Card image courtesy of the Pokemon TCG API.