Ungraded vs MS66 1966 [SMS PROOF] Washington Quarter: price difference
1966 [SMS PROOF] Washington Quarter value — Ungraded $20 vs MS66 $73. MS66 sells for 3.65× Ungraded (+265%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
MS66 sells for 3.65× (+265%) the Ungraded price — a $53 difference per coin.
MS66 sells for 3.84× (+284%) the MS62 price — a $54 difference per coin.
Should you get this coin graded?
Grading runs about $30 per coin all-in. On 1966 [SMS PROOF] Washington Quarter, the jump from Ungraded to MS66 is worth $53 (3.65×) — 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).