I think you got a decent deal for 10% over spot. My gut feeling is it that these are all restrikes for the China trade so they should be 90% silver. If you can get a measurement of the average thickness, then you can calculate the specific gravity to check on how much silver is in there.
I agree based on the dies that these will likely test as Chinese trade restrikes. If so a handheld XRF tester should show at least 0.2% gold in the alloy.
This is the Keyhole Porthole variety I have written about before. SG should be correct. The weight is correct.
The price is good even if the coin is not genuine.
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