So while I was out today I got this in change. I have a feeling someone might say acid dip but could just plain old wear take this much weight off the coin. The thickness is the same as other Lincolns so makes me think that rolled on thin planchet is out of the question but wouldn't that also make acid dip out of the question also? The third photo is a pic of 3 Lincolns and the middle one is the 1940. I know i'll probably get slack for saying possible struck on foreign planchet but hey here's to wishing lol.
ok im going to a deduction reasoning on this the acid/wear wore the design which is obviously worn down but left enough that the thickness is still the same?
The eye has a very hard time measuring small differences in thickness without a mm ruler or similar. Same is true with diameter. If you can find a mm ruler, try to get an accurate measurement of both. Did you calibrate the balance with other cents? I strongly suspect acid action on a worn cent without more measurement accuracy. Thanks, Jim
