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PSA 10: 1 sale, last 45 days · Oct 1, 2026 · checked Oct 27, 2026
PSA 9: Median of 2 PSA 9 sales in the last 90 days, latest 2026-09-08. Grade 9 guide (all graders): $18.
Grade 7 and Grade 8 are PriceCharting guides across all graders (PSA, CGC, BGS, SGC, TAG).
GemDelta shows Colress's Experiment (Crown Zenith #GG59) at $3.44 market price (TCGplayer market). Its Delta multiple is 29.1x.
A PSA 10 Colress's Experiment (Crown Zenith #GG59) is currently shown at $99.99, the only PSA 10 sale in the last 45 days (Oct 1, 2026).
GemDelta records a 54.4% gem rate for Colress's Experiment (Crown Zenith #GG59), with 468 PSA 10 copies out of 860 total PSA grades and a 29.1x Delta. That describes the grading profile; it is not financial advice.