The xtra metal, or what ever it is, was not on the coin when it left the mint 88 years ago.
Most likely it is solder, putty or glue that was used to attach the coin to a belt buckle, bracelet, tie tack or something similar.
You can try to soak it in acetone to see if it is glue and if it will dissolve and come off cleanly. If it's metal it will not come off cleanly . ever!
Other than the spot of "what ever it is" it is a nice "fine" to "very fine" coin!
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