scottish

What's beneath the surface has always fascinated my curiosity. This remarkable relic was recently unearthed on our past Presidents day here in the States. I know what a 💩📺 🤣 at the moment but, let's not loose topic! Unknowingly, I was unaware of this relics identity & past purpose...

This was in my grandmother's things after she passed. It doesn't appear to be valuable at all, but I am wondering the significance of it. (It's a fairly heavy piece of metal and says Japan on the back.) Any clues would be appreciated. Thank you!