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My parents had one almost identical; they got theirs in India or China, I don't recall which - around 1960.
It appears the Hitler picture shows him being shot through the head, for whatever that is worth. If anyone is interested in more about Harvey...
Many aspects can be difficult or confusing at first, including how much or how little should be said. Everything will be OK.
Welcome! I have a small collection of stereocards, mostly ones that belonged to my Grandmother, but I've added some with Native American/First...
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