Ahhh crazybo broke out the stash SMS 67 example in an old green holder. What else you holding out on us crazybo?
Seeker in no time you will know the SMS cents in your sleep from the circulation strike coins. Occasionally SMS coins are found in circulation and with wear are still easily attributed. Its the rim that's the dead giveaway followed by clear strong die state. You can buy an SMS set still in the holder for 10-12 bucks on the bay or a coin show compare one in hand to your examples and its night and day.
I have a 1966 set I cracked open to show kids the differences, I let them handle them carefully by the rim and move them to and fro under a loop. You will get this down pat just keep learning.