Ungraded vs PSA 10 Diego Segui #309 1966 Topps Baseball: price difference
Diego Segui #309 1966 Topps Baseball value — Ungraded $2 vs PSA 10 $367. PSA 10 sells for 183.5× Ungraded (+18250%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
PSA 10 sells for 183.5× (+18250%) the Ungraded price — a $365 difference per card.
Grade 9 sells for 67.5× (+6650%) the Ungraded price — a $133 difference per card.
Should you get this card graded?
Grading runs about $30 per card all-in. On Diego Segui #309 1966 Topps Baseball, the jump from Ungraded to PSA 10 is worth $365 (183.5×) — 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).