Mr.Q, asked: "Why would anyone want to put a pencil mark on a coin anyway?" For the same reason museums used paint or ink to mark specimens.
I'm no expert (an "ex" is a "has been" and a s-"pert" is a drip under pressure) but I agree with Mountain Man. An artist eraser, in my time called gum erasers, should do the trick. DO NOT RUB. Just press down and lift. Try it on a common coin first. Good luck.
I was in management in retail in a large drugstore. Hundreds of locations. Every day a deposit would be done. Same when I was with the postal service, a nightly deposit. Both places dudctge same thing. The bills were placed in stacks, a stack of ones, a stack of fives, etc. until all denominations were stacked. Then each stack was counted and the total was written on the top bill. Do the math and if it all worked out then you finished the deposit. If not, recount the piles and find the mistake. Scratchout and rewrite the number on the bills. Make the deposit and coins, while kept to a minimum, were treated the same way.
Not that it really matters but all of the coins had ‘110’ written on them. No idea what 110 could mean?
Precisely. And those same micro-crevices are why Unc coins tone oh so easily and circ coins rarely do.
Hmmm - that's a new one on me, never heard of the stuff. I'd sure be hesitant to use it on a coin that was worth anything though.
I have heard of and used gum erasers, but never that you could just press them onto something and get any results.
To be clear, these are not gum erasers. They are a soft, pliable, putty-like eraser. Think Silly Putty.
Thanks, if there is a picture, you can right-click on it and use the "search google" command that pops up... https://en.wikipedia.org/wiki/Kneaded_eraser