Hi all I have this 1939 1 Gulden from the Netherlands, I'm hoping some can verify its authenticity, the coins weighs 9.91 grams, thanks for any help 

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Weight looks ok, and so does general appearance. Plus it is not a very rare or valuable coin, so why bother faking it?
Maybe show the edge lettering as well, and take a close-up of the first quadrant (between 12 and 3 hours) of the reverse (value side). There should be a very small pearl between the row of pearls and the edge, but I can't see it in your pic.
DuikerTS
Weight looks ok, and so does general appearance. Plus it is not a very rare or valuable coin, so why bother faking it?
Maybe show the edge lettering as well, and take a close-up of the first quadrant (between 12 and 3 hours) of the reverse (value side). There should be a very small pearl between the row of pearls and the edge, but I can't see it in your pic.
The holographic specs on the obverse was genuinely one of my concerns with this piece, thanks for the assistance
Holographic specs?
The coin has a 28% copper content, so I would expect green/blue blemishes.
DuikerTS
The coin has a 28% copper content, so I would expect green/blue blemishes.
Can you post some pictures of others with green/blue blemishes?
Thanks. The green on the OP's coin looks more like flakes on the surface.
Indeed, and the cause can be anything. Probably contact with something that reacts strongly with copper.
But the original point was that blue/green blemishes look normal to me. Red for instance would be strange.
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