Koffing #51 PSA 10: price & population
PSA 10
$137.48
Raw
$1.88
PSA 10 pop
395
Gem rate
27.7%
A PSA 10 Koffing #51 from Base Set sells for $137.48 — a 7,213% premium over the $1.88 raw price. PSA has graded this card 1,425 times; 395 came back a 10 (27.7% gem rate), and 618 a PSA 9.
The 9-to-10 spread
PSA 9 sells for $36.00. The jump from 9 to 10 is worth $101.48 — that spread, times your real odds of the 10, is what decides whether grading pays.
Prices from real completed sales, updated daily. Population data from PSA's public population report.
