To what group do these mystery cups belong?






French thread. Rifled holes.
Inside each cup, on either side of the bearing race, are black plastic or hard rubber rings. I can guess that the larger ring is designed to mate with a plastic sleeve to protect from water inside the bottom bracket shell. Does the smaller black ring mate with a similar ring on the axle?

Thanks,
Brent

I think you are messing yourself up. Those look like Super Record or Corsa Record cups- both were aluminum with pressed in races, where the races were not ground they appear black oxide. Time for a magnet test. The issue I think will be a matching spindle - ti super record with the pressed on steel races or the even more rare Corsa Record- both take 3/16" ball bearings

Wouldn't be the first time!

That was quick!
They are indeed aluminum with pressed-in races. I should have mentioned that. Where I messed myself up was in thinking the oxide was plastic!

Thanks!