My father recently passed and I found this coin as we were going through his things. He was a history buff and collector of maps, books, etc., but not the type to dive deep into provenance. This left us with no information about the coin. I’ve attached photos with a US dime for scale. It appears to be silver and weighs roughly 17.5 grams. Would anybody be able to help me identify it and its potential value? Honestly, just knowing what and when are more important than what it might be worth. Thanks in advance for your help.



