I agree with the comments above. They sure look like the Camcos I've had. Nice drums.

One thing to note is that drums built for natural finish aren't always suitable to add wrap without having to hold it back near the bearing edge. I think Slingerland marked their shells inside with P and M for pearl and maple exteriors because the shell diameter differed. Others probably know the facts better than I and can comment. If you measure one of your pearl drums in the same size against the natural finish ones, you may find a variance in diameter.

Assuming they are indeed Camcos, you've got a couple of rare birds.

Interesting - thanks for that tip Dan about the bearing edge on natural finish drums. That makes sense. The more I think about it the more I'm inclined to just leave the natural finish.

As a heads up on grommet type, early to mid era Oaklawn had chrome grommets. By the late 60s Oaklawn, then Chanute and LA eras all had brass grommets.

Thanks Antipodes - good to know about the grommets!