Koffing

Koffing (51/102), the Common from Base Set, has an estimated ungraded market price of about $1.30. Note: 25 other cards named Koffing exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Koffing (51/102), the Common (about $1–$2) from Base Set.

The other versions: #243/236 from Cosmic Eclipse (Secret Rare, about $33–$43); #SV076/122 from Shining Fates Shiny Vault (Shiny rare, about $6–$8); #114/165 from Expedition Base Set (Common, about $5–$6); #72/113 from Delta Species (Common, about $3–$4); #62/107 from Deoxys (Common, about $2–$3); #74/106 from Great Encounters (Common, about $1–$2); #61/109 from Team Rocket Returns (Common, about $0.90–$1); #68/111 from Rising Rivals (Common, about $0.80–$1); #54/109 from Ruby & Sapphire (Common, about under $1); #57/135 from Plasma Storm (Uncommon, about under $1); #58/82 from Team Rocket (Common, about under $1); #70/123 from HeartGold SoulSilver (Common, about under $1); #60/95 from Call of Legends (Common, about under $1); #56/135 from Plasma Storm (Common, about under $1); #50/108 from Evolutions (Uncommon, about under $1); #27/124 from Fates Collide (Common, about under $1); #73/214 from Unbroken Bonds (Common, about under $1); #41/72 from Shining Fates (Common, about under $1); #76/236 from Cosmic Eclipse (Common, about under $1); #94/198 from Chilling Reign (Common, about under $1); #109/165 from 151 (Common, about under $1); #091/159 from Journey Together (Common, about under $1); #112/192 from Rebel Clash (Common, about under $1); #28/68 from Hidden Fates (Common, about under $1); #075/159 from Crown Zenith (Common, about under $1).

The collector number printed at the bottom of the card is the reliable way to tell them apart.

Ahead after fees: with a 28% PSA 10 gem rate and current graded prices, grading a near-mint Koffing (51/102) is estimated to net about $27 more than selling it raw (est.).

Assumes ~$25/card bulk-rate grading (standard service costs more); ignores turnaround time, sub-9 grades, and shipping. A screen, not a promise.

Koffing (51/102) is a Common. PSA has graded 1,390 copies to date, so graded supply is measurable and growing.

Of the 1,390 copies PSA has graded, 28% earned a PSA 10. That's a low gem rate, so flawless copies are genuinely hard to come by. Grade-by-grade population and pop-over-time appear with Riffle premium.