![Horsea of the Seafoam Islands [Series III] #4 from Pokemon Japanese Vending](https://storage.googleapis.com/images.pricecharting.com/dfe213bedcd739abe7da21081b9905b0d33cf395d31d47b610db03baf4fb5c78/1600.jpg)
Horsea of the Seafoam Islands [Series III] #4 PSA 10: price & population
PSA 10
$114.75
Raw
$15.99
PSA 10 pop
206
Gem rate
55.8%
A PSA 10 Horsea of the Seafoam Islands [Series III] #4 from Japanese Vending sells for $114.75 — a 618% premium over the $15.99 raw price. PSA has graded this card 369 times; 206 came back a 10 (55.8% gem rate), and 108 a PSA 9.
The 9-to-10 spread
PSA 9 sells for $50.00. The jump from 9 to 10 is worth $64.75 — 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.
