Hi Crater, yes mintmarks were placed on coins to identify branch mint production location (where it was made). San Francisco used an "S" mintmark on nickel-copper
Jefferson nickels 1938 through 1964. San Francisco struck the fewest
Jefferson nickels of the three mints throughout the early years; 1938 to 1964. A total just over 230 million nickel-copper alloy coins. Low mintages signal to collectors a less available coin and in general values follow with slightly higher premiums but you will still have to go to work or play powerball next week if you want to retire.

Please visit this link for a nice overview of
Jefferson nickels:
https://www.coinstudy.com/jefferson...-values.html
Edited by datadragon
02/06/2023 5:05 pm