New to me also, I would say door knob but the core suggests otherwise ?? All the flatter ones I've seen like that are from earlier models, made of Bakelite "nice score "
Springtime Chinook salmon & Steelhead fishing is my go to. I get itchy every Spring to get out & this is the perfect way to do it. This pic was taken only about 3 miles from my house along the Columbia river a couple years back. I have mostly given up taking pix of these, I believe after over 50 years of fishing I have enough. I consider myself very lucky to have grown up & live where I do, Mt. St. Helens is 50 mi. away, Portland is 50 and the coast is 50 so well within reach of nearly anything I'd ever want to do.
Me, Paul & Kirk with our limits of spring Chinook after a long day of fishing off one of the many Islands on the Columbia.
Yes, I see the #13 as a miniature pool ball as well;, nice load of marbles, I bet ya can't wait till ya get em hopefully the condition is satisfactory.