Whether a factor or not, tanning of leather did make a big change in approximately the 1840s by using chromium based chemicals as an important...
Here is an article that has some content data of D- coins, but gives insight into the production of those times....
If they are transmission electron microscopes, they only see through objects, Scanning electron microscopes bounce the beam off of the surface and...
PVD . post vehicular damage :)
They are both used. MD= Machine doubling. MDD= machine doubling damage. I don't use Machine damage doubling, but assume it is the same. Jim
I keep posting this , but many have never thought that plating a cent could be a popular "Joke". from Numismatic Scrapbook circa 1960. By the way...
No, the "D" cent 7 appears in the photo that the top extension of the 7 has been hit /pushed downward giving the appearance you mention. There are...
I would go MDD, the numerals show a lessened effect in the same direction. Sorry , Jim
Maybe a Youtube ? Also just kidding .....:)
In the first photo under the front curl of hair, around lincolns face and eye socket, the depression area where the zinc might not have reached,...
Looks like there is copper beneath, so I would say at this point, the famous "silver penny (zinc plated) science experiment. The rough areas could...
Rick , if you do decide on a scope like the Am scope, I would not expect much from the 1000X objective. Any magnification above about 700X should...
https://microscope-microscope.org/microscope-info/image-resolution/
https://www.finishing.com/424/58.shtml
No offense at all. Thanks for your kind response. Jim
How could the die be doubled if there was only one contact ( single squeeze)? Because mechanical movement occured ( vibration) as the single...
Green is a lot younger than us Kentucky...guess that's why he dances to the new music :)
Thad , stop by more often!! Hope all is well , Jim
Please understand , I am following the forum's guide that a member can diss a coin, but not members, so understand I am talking about the coin...
It doesn't seem like it is rare to find a single squeeze die disturbance, as they are not hubbed "doublie die "., just vibrate during the strike. :)
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