![Maintenance [1st Edition] #79 from Pokemon Japanese 20th Anniversary](https://pokeinvest-japanese-card-images.nyc3.cdn.digitaloceanspaces.com/20th_Anniversary/047_Maintenance.jpg)
Maintenance [1st Edition] #79 PSA 10: price & population
PSA 10
$216.00
Raw
$4.29
PSA 10 pop
14
Gem rate
87.5%
A PSA 10 Maintenance [1st Edition] #79 from Japanese 20th Anniversary sells for $216.00 — a 4,935% premium over the $4.29 raw price. PSA has graded this card 16 times; 14 came back a 10 (87.5% gem rate), and 1 a PSA 9.
The 9-to-10 spread
PSA 9 sells for $180.00. The jump from 9 to 10 is worth $36.00 — that spread, times your real odds of the 10, is what decides whether grading pays.
The September 2026 Grade Report ranks the 30 most profitable cards to grade right now, by expected profit after every fee. Same math as this page, run across the whole market. $29, one time, instant.
See the top 30 →Prices from real completed sales, updated daily. Population data from PSA's public population report.
