I have examples of several years including a 1916-D that display that same issue. Here is a pic I have handy.
I purchased a collection that was in a flood back 2018 and 75% of the collection was graded by PCGS and NGC. Unfortunately the insurance company had all of the coins removed from the holders so they could be appraised and resold. With that said I own two of every Mercury Dime released and to me I have always thought they were all counterfeits seeing I bought the whole collection so cheap. 5000 coins at face value. (Cited from: https://www.cointalk.com/threads/mercury-dime-letter-wrong-in-god-we-trust.322970/page-2)
This the reason for insuring your collection and not relying on homeowners to pay out in situations like that. I am sure that when disasters happen insurance companies call in the pros.