I've found a handful of those here, in Lake Erie...
I've always wondered what they could have been, always assumed they were net weights hand made by natives during the contact era... Still could be, but, I've only found them in one specific beach area... Where as, I should be finding them throughout all of my hunting areas...
Mine all look like the ones shown in the fourth and eighth picture down...
Is there any possibility these could be found in the states?