Ungraded vs MS66 2015 S [U.S. MARSHALS SERVICE PROOF] Modern Commemorative: price difference
2015 S [U.S. MARSHALS SERVICE PROOF] Modern Commemorative value — Ungraded $19 vs MS66 $107. MS66 sells for 5.63× Ungraded (+463%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
MS66 sells for 5.63× (+463%) the Ungraded price — a $88 difference per coin.
Should you get this coin graded?
Grading runs about $30 per coin all-in. On 2015 S [U.S. MARSHALS SERVICE PROOF] Modern Commemorative, the jump from Ungraded to MS66 is worth $88 (5.63×) — 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).