1970-S Doubled Die Reverse WDDR-001

Description

Cataloged by the Wexler Team as 1970-S 10¢ Pr WDDR-001 and cross-referenced as CONECA 1-R-V, this proof Roosevelt Dime doubled die reverse holds the primary WDDR catalog position for the 1970-S proof date, indicating it is the most significant documented reverse hub doubling for this issue. The CONECA classification 1-R-V indicates a Class V (Pivoted Hub Doubling) mechanism — one of the more diagnostically interesting forms of hub doubling, where the working hub was slightly pivoted around a fulcrum point between impressions, producing doubling that increases in magnitude as distance from the pivot point grows. This progressive intensity gradient serves as a built-in authentication feature, as the doubling spread should visibly increase across the affected design elements in a consistent directional pattern. The 1970-S proof Roosevelt Dime was struck at the San Francisco Mint on polished planchets with mirror-finish dies, and these highly reflective proof surfaces provide maximum contrast for detecting even subtle hub doubling against the mirrored fields. John R. Sinnock's reverse features a torch flanked by olive and oak branches — symbolizing liberty, peace, and strength — with E PLURIBUS UNUM above and UNITED STATES OF AMERICA and ONE DIME inscribed around the periphery. The 1970-S proof dime was struck in copper-nickel clad composition — 75% copper and 25% nickel outer layers bonded to a copper core — weighing 2.268 grams with a diameter of 17.91 mm and a reeded edge. The dual attribution under both Wexler and CONECA systems confirms this variety's significance, and the primary WDDR-001 catalog position marks it as the anchor variety for 1970-S proof reverse hub doubling documentation.

Attribution History

• Discovered by Kevin Flynn Cross References: CONECA: 1-R-V
• CONECA: 1-R-V; Wexler Variety ID: 1970-S 10¢ Pr WDDR-001
• Expert attribution by Wexler Team

External References