![Koffing [Green Back] #109](/api/images/junkpal-products/cards/koffing-green-back-109-pokemon-japanese-topsun-card/img0/cover.webp)
Ungraded vs PSA 10 Koffing [Green Back] #109: price difference
Koffing [Green Back] #109 value — Ungraded $6 vs PSA 10 $236. PSA 10 sells for 39.33× Ungraded (+3833%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
PSA 10 sells for 39.33× (+3833%) the Ungraded price — a $230 difference per card.
PSA 10 sells for 7.38× (+638%) the Grade 9 price — a $204 difference per card.
Should you get this card graded?
Grading runs about $30 per card all-in. On Koffing [Green Back] #109, the jump from Ungraded to PSA 10 is worth $230 (39.33×) — if your copy grades at the top, that premium can cover the fee. A grade below the top one changes the math, so run your exact numbers first.
Run the grading break-even math →Values are estimates from real sales data — not appraisals or offers. Some links earn JunkPal a commission at no cost to you (disclosure).