Due to the toning pattern being parallel with the marks, it is clear they were on the planchet before it was struck. Because those marks were located at the deepest portion of the dies, there was little to know pressure applied to the planchet at that area so the marks remain. On the other hand, the fields received significant pressure during striking thus the marks were mostly stamped out.
Some call them roller marks. Some call them drawing bench marks. Either way, a series of parallel grooves in the surface of the planchet prior to the strike. As was pointed out some of the grooves were struck flat, but left an effect on the toning.
Numismatist. 50 year member ANA. Winner of four ANA Heath Literary Awards; three Wayte and Olga Raymond Literary Awards; Numismatist of the Year Award 2009, and Lifetime Achievement Award 2020. Winner numerous NLG Literary Awards.
I apologized for that, because when I post the first one, it gave me an error. I thought I forgot to put something on the topic summary which has an asterisk that is required to fill. The same thing happened on my second post and finally the third one went through without any error.
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Complete US-PHIL Coins for Sale, Circulation Strikes 1903-1945
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Complete US-PHIL Coins for Sale, Circulation Strikes 1903-1945