| Base Set 1st Edition KOFFING #51/102 PSA 8 1999 Pokemon Card Game | $48.76 USD | graded | PSA | 8 | 4/5/2026 |
| 1st Edition SPANISH Koffing 51/102 Base Set - Common Pokemon Card - NM/Mint | $3.71 USD | raw | - | - | 4/5/2026 |
| Pokemon TCG Koffing Base Set 51/102 Unlimited Common Card WOTC LP-NM | $1.66 USD | raw | - | - | 4/5/2026 |
| KOFFING - Base Set - 51/102 - Common - Pokemon Card - Unlimited Edition - LP | $1.45 USD | raw | - | - | 4/5/2026 |
| Pokemon Koffing 51/102 from Base Set Shadowless 1st Edition in a CGC 8.5 !! | $49.00 USD | graded | CGC | 8.5 | 4/4/2026 |
| Pokémon TCG Koffing Base Set, Shadowless Common Card 51/102 | $0.99 USD | raw | - | - | 4/4/2026 |
| Koffing 51/102 Common Base Set Shadowless Pokemon Unlimited MP | $0.72 USD | raw | - | - | 4/4/2026 |
| Koffing 51/102 Unlimited - Base Set - PTCG - LP | $1.70 USD | raw | - | - | 4/3/2026 |
| Pokémon TCG Koffing Base Set 51/102 - NM/LP - WOTC VINTAGE | $1.45 USD | raw | - | - | 4/3/2026 |
| Koffing Base Set Shadowless Pokemon Card 51/102 NM | $0.99 USD | raw | - | - | 4/3/2026 |
| KOFFING 51/102 COMMON BASE SET SHADOWLESS POKEMON NM/M | $7.99 USD | raw | - | - | 4/2/2026 |
| Koffing 51/102 Base Set - Common - Pokemon Card TCG - WOTC Near Mint | $2.44 USD | raw | - | - | 4/2/2026 |
| Pokemon PSA 9 1st Ed. Koffing SHADOWLESS - 51/102 - Base Set | $84.00 USD | graded | PSA | 9 | 4/1/2026 |
| 1999 POKEMON BASE UNLIMITED SET 1ST EDITION #51/102 KOFFING PSA 9 | $79.89 USD | graded | PSA | 9 | 4/1/2026 |
| Koffing 51/102, 1999 Base Set, Pokémon TCG, WotC, Vintage, Common, NM/LP | $1.49 USD | raw | - | - | 4/1/2026 |
| Pokémon TCG Koffing 51/102 Base Set NM | $1.49 USD | raw | - | - | 3/31/2026 |
| Koffing 51/102 Unlimited C Base Set Shadowless NM Pokemon | $5.00 USD | raw | - | - | 3/29/2026 |
| 4th Print Base Set Koffing Pokemon Card 51/102 Vintage LP-NM | $4.49 USD | raw | - | - | 3/29/2026 |
| Pokémon TCG - KOFFING - 51/102 - 1ST EDITION/SHADOWLESS - BASE SET 1999 - CGC 9 | $52.24 USD | graded | CGC | 9 | 3/28/2026 |
| KOFFING 51/102 BASE SET UNLIMITED POKEMON TCG CCG 1999 NM | $2.99 USD | raw | - | - | 3/28/2026 |
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