2000-S Atypical Die Clash ADC-1C-2000S-01

Description

Cataloged by MadDieClashes as ADC-1c-2000S-01, this atypical die clash variety appears on a 2000-S proof Lincoln Memorial cent struck at the San Francisco Mint. The 2000-S proof cent was produced in the copper-plated zinc composition, weighing 2.5 grams with a 19 mm diameter, as part of the annual proof set that San Francisco has produced exclusively since 1968. What qualifies this clash as atypical rather than typical is specifically that it occurs on a proof coin, a distinction the MadDieClashes catalog considers noteworthy because die clashes on proof coinage are significantly rarer than on business strikes due to the more controlled production environment and closer quality inspection applied to proof die operations. The obverse die shows a dual set of clash marks, indicating the dies came together without a planchet between them on two separate occasions, each leaving its own set of transferred design impressions. The clash marks on the reverse die are less apparent and may have been obscured by the frosted cameo finish applied to proof coins, which can mask subtle surface details that would be more visible on the reflective fields of a standard proof or the flat surfaces of a business strike. This specimen was encapsulated by PCGS (Professional Coin Grading Service) and is documented as being in the private collection of Neal Burnett. The MadDieClashes reference represents the most comprehensive catalog of die clash varieties on United States coins, distinguishing between typical clashes that show standard obverse-to-reverse design transfer and atypical clashes that involve unusual circumstances such as proof strikes, rotated clashes, or multi-denomination clashes. The San Francisco Mint's proof production line employs hydraulic presses that deliver more precisely controlled strikes than the high-speed production presses used for business strikes, making the occurrence of any die clash event during proof production an unusual manufacturing anomaly.

External References