Ungraded vs MS66 2018 S [REVERSE PROOF] Sacagawea Dollar: price difference
2018 S [REVERSE PROOF] Sacagawea Dollar value — Ungraded $13 vs MS66 $48. MS66 sells for 3.69× Ungraded (+269%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
Ungraded vs MS66
$13→$48
MS66 sells for 3.69× (+269%) the Ungraded price — a $35 difference per coin.
Should you get this coin graded?
Grading runs about $30 per coin all-in. On 2018 S [REVERSE PROOF] Sacagawea Dollar, the jump from Ungraded to MS66 is worth $35 (3.69×) — 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).