Standard Vintage Ring Sizer Mandrel

Got this old school ring sizer mandrel. It's got a wooden handle and the sizing part looks like it's made of bone or maybe some kind of early plastic, not totally sure. It's marked Standard and has sizes 1 through 13 on it. Definitely has some age to it and a cool vintage look if you're into jewelry making or just want a neat display piece. The wood has a nice dark patina and there's a little ring on the end to hang it up.