Belgium 25 Centimes - Baudouin I (Dutch text), KM# 154 with a different color? [opgelost]

Hi,

I found this coin (in the picture on the right), but I can't seem to find this gold-like color in the catalogues. It doesn't look painted, as the color is even everywhere, even on the edge. The weight is 1.8 grams, the same as the coin on the left. The coin does feel a bit cooler to the touch compared to the one on the left, but I don't know if that says anything.

Does anyone have an idea what this is?




Thanks!

I would guess someone fooling around with electroplating.

It is gold-plated, and probably reduces the small value.