Which Koffing do you have?

Same name, 162× the price: $0.25 to $40 raw. The difference is printed on the card — it is just not somewhere most people think to look.

Base Set 1st Edition · #51 A black 1st Edition stamp below the left of the illustration. These are also shadowless - the stamp is the thing to look for first. $24 22% gem Base Set Shadowless · #51 No stamp, and no drop shadow down the right edge of the illustration frame. The card looks flatter and slightly paler than the common printing. $1.72 20% gem Base Set Unlimited · #51 A drop shadow down the right edge of the illustration frame. This is the common printing - most Base Set cards people own are this one. $6.86 28% gem Intro Pack (Bulbasaur) · #39 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $40 31% gem Dream League · #056 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $29 89% gem Shining Fates · #SV076 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $10 54% gem Shiny Star V s4A · #275 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $5.49 82% gem S-P Promos · #180 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $5.00 67% gem Shiny Star V s4A · #104 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $4.89 80% gem Rocket Gang · #109 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $3.52 34% gem Team Plasma Powered Half Deck · #002 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $3.39 50% gem Great Encounters · #74 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $3.12 <0.1% gem Expedition · #114 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $2.61 34% gem Expansion Pack · #109 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $2.60 43% gem Team Rocket 1st Edition · #58 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $2.56 24% gem Delta Species · #72 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $2.33 56% gem Rising Rivals · #68 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $2.25 20% gem Jet Black Spirit · #044 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $2.18 50% gem Plasma Storm · #57 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $2.11 no PSA data Deoxys · #62 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $2.02 56% gem Sky Legend · #027 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.98 100% gem Hidden Fates · #28 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.80 46% gem Cosmic Eclipse · #76 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.80 50% gem Dream League · #021 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.79 100% gem Team Rocket Returns · #61 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.78 36% gem Unbroken Bonds · #73 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.76 no PSA data Double Blaze · #034 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.75 100% gem HeartGold SoulSilver · #70 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.62 <0.1% gem Plasma Storm · #56 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.60 <0.1% gem Team Rocket · #58 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.55 18% gem Ruby and Sapphire · #54 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.51 37% gem Call of Legends · #60 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.42 14% gem Fates Collide · #27 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.31 100% gem Evolutions · #50 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.26 15% gem Chilling Reign · #094 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $1.24 50% gem Shining Fates · #041 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $0.99 63% gem Rebel Clash · #112 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $0.80 33% gem Rebellion Crash · #063 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. $0.25 no PSA data Intro Pack Neo (Chikorita) · #010 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. — 41% gem Moonlit Pursuit · #031 Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them. — no PSA data

Prices are raw market value. Click a printing for its full grading verdict — the gem rate, the fees and whether it beats selling raw.