I've never come across the 'crispy'/sharp feel of a coin as an indication of MS. Are you referring to a sharp appearance, or a sharp/crispy tactile feel?
Vintage mechanical vending machines can leave circular features in the center of coins. I've come across more than a few nickels and quarters (and some dimes) with the circular 'swirl'. Nearly all were from the 30s-50s.
Vintage mechanical vending machines can leave circular features in the center of coins. I've come across more than a few nickels and quarters (and some dimes) with the circular 'swirl'. Nearly all were from the 30s-50s.






















