The bottom gun is an inexpensive import, probably made from zinc alloy; they were imported by the same companies that brought in the RG-10 and other fine examples of European craftsmanship. If it works, it works, but it might not work for long, and don't use any "hot" loads.
The other looks old, but I think it, too, is modern. I am not intimately familiar with all the Sharps models, but I don't think that is one of them.
Jim
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