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▤The Morning MarketEDITION № 78 · REBUILT 6:00 AM PT↵
❏Set Guide17 SETS · THE WOTC ERA · 1999–2003G S
◫Live Listings7,461 ACTIVE · VERIFIED EBAYG L
§MethodologyHOW GEMBOOK VALUE IS BUILT
SETS
❏BaseJAN 1999 · ORIGINAL ERA
❏JungleJUN 1999 · ORIGINAL ERA
❏FossilOCT 1999 · ORIGINAL ERA
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MarketsEDITION № 78Sets17 SETS · WOTC ERAListings7,461 LIVEMethodology

Early access

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© 2026 Gembook

Base/#51/102Gembook Valuei·PSA 10As of Jun 18, 2026 · updated daily at 6:00 AM PT
Confidence Moderate · weighted median of 11 verified sales
Fair range $439–$876

Koffing

$750
#1618Overall#195in Base2.5%SET · 30D
1ST EDITION · PSA 10
Koffing — Base 51/102
Price History170.8%
$352$597$843Sep 25Feb 26Jun 26

Details

SetBase
Number51 / 102
Released1999
PSA population631
Price confidenceModerate
Fair range$439–$876
Last sale$880 · Jun 5, 2026
Live listings1 · checked daily

Recent sales

11 verified · 5 shown
Jun 5, 2026eBay$880+$130
May 17, 2026Fanatics$336−$414
May 15, 2026eBay$500−$250
May 11, 2026eBay$876+$126
May 3, 2026Fanatics$552−$198

Live listings

1 on eBay
eBay$996View ↗

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How we price this

Gembook Value is the weighted median of 11 verified eBay sales. Shill bids, unpaid items, and outliers are filtered out — the numbers you see actually cleared.

Methodology →