Mystery object - Tibetan amulet

This flat, metal object, maybe 3" by 3", was amongst the items that belonged to my Father and were shipped over to me in Canada after my Brother died. I have no idea what it is - will try and remember to post a photo of the other side, which is completely different. Thought it was rather interesting. Another possibility is that it might be something that we bought for my Parents or Brother when we were living in Borneo decades ago. It has a similar look to an old Chinese coin that I have. If anyone has any suggestions, they would be greatly appreciated - thanks!