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Re: Uncle Sam Bank
Look carefully at the bottom of the base, and see if you can see any indication of a patent date. If there isn't one there that's a strong indicator that it's probably a repro. I did find a example of an original:
http://caseantiques.com/item/lot-583-uncle-sam-cast-iron-mechanical-bank/
It appears to be significantly different than yours, which again, makes me think it's likely a reproduction.
A similar example can be found here:
http://www.fineselects.com/products/uncle-sam-mechanical-piggy-bank
The asking price of $50 on that one seems to be about average...