Thank you for answer.
i got thise 2 variants also at my colletion ,imo the badge on te left is a tombak and the right badge is the most commen , will be made of zinc
the left badge will be thinner ,please compare them ...you will noticed.
Indeed, the left is thinner than the right one. But if feels more zinc than tombac to me. But now I'm a little more confused
Thank you Jonas for your pics, they are great for my education