I do not believe it is solid gold. There are too many spots on the metal. The gold plating might be 9ct but this would not indicate solid gold.
It looks old and I do feel it is probably at least 40 years old but not over 80 years old.
$800 is far too much for this poorly ID marked piece as unusual as it is.
I would take it back for a refund.
I truly wish I had better news.
In general, a private seller to a dealer, via consignment or at auction can expect 30-50% of estimated retail value.
Insurance replacement values are usually about 10% more than retail values.
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