I thank you for posting this - really interesting. I had only known about the 1944 counterfeit, and when you posted your 1947 I went and looked it up and found the other dates you mentioned above. I search nickels (about $32,000 worth since I started keeping records in 2019) looking for silvers, buffaloes, and key dates, but never knew about these. Now I have something else to be on the lookout for. Thanks again.