Wondering if anyone has an idea of what type of planchette this may be. Non magnetic and weighs 4.5 grams and is slightly larger than a U.S cent.
Possibly for a medal or token. Upset rims on unstruck coin planchets don't look like that. Here is a clad quarter type 2 planchet.
The token you posted is flat/blank struck . It really is no longer a planchet due to it being struck. Note the sharp 90° edge from the field to the rim. Very similar to this one.
Beyond the sharpness of the rim, striking of the blank is further evident from short, but obvious outward radial flow lines in one of the two photos.
Very interesting. It does appear by weight and size to be foreign. I don't have a clue but sure would like to know. Good luck.