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Looks like around $1000:
Sorry but I'm not an expert in collectible American clocks. I've merely provided you with examples of what similar clocks have sold for at auction. If there's a specialist market you're aware of you'd best approach them.
I'm afraid I can't assist you further on this. You could try resubmitting to the antiques category but I'm not sure this qualifies as an antique, being only 25yrs old.