Any Reason For Marked Coins?

to the community

I dunno about the Peace dollar but some people mark coins to see if they are going through the same coins when they roll search

don't know about dollar coins, explanation aboved seems plausible, I know way back in the 50's soda shops, bars, etc used to mark quarters with paint or gouge them to identify them as "house" money used to feed the juke box and keep the crowd entertained if no one else did, then the vender would give them back to the house when they emptied the juke box, then places started getting their own juke boxes and the practice died off.

acetone may take it off. I would not rub to much on the Peace dollar

I worked in a place that used to mark coins when the machines malfunctioned, i.e., didn't deliver when a patron put their coin in. We used to get a credit for the marked coins, which were colored red with a magic marker.