Reference I'm using shows,
+/- .13 grams, (1873 - 1982) for copper/bronze. same tolerance for the 1943 zinc-plated steel cents.
+/- .10 grams, (1982 - present) for copper-plated zinc.
Any foreign substance on coin can add on to weight. Can't tell in the current images whats on the coins surface. Maybe dirt, stained or toned.
If surface is clean and scale is calibrated, maybe possible planchet evolved from a slight rolled thick stock or a bit heavy on the copper plating. Thanks, Doug.
Second opinions are always recommended. Rookies thoughts!
Backup data often or good luck with the recovery process..... SME advice!
Edited by Halo1st
08/09/2018 11:58 am