Rolled copper ring?

[Nick79]

From a site that was busy in the 1800s, but lots of modern junk too. Haven't seen a rolled one before, any ideas?
Thanks

 

[HuntinDog]

Curtain or shower rod ring

 

[Tony in SC]

Since the seam is on the side I would say it's a compression seal.

 

[Nick79]

Thanks I was wondering about a compression ring too

 

[dirtdigginfool]

I agree w Tony and Nick, I use a lot of those when installing exhaust systems on motorcycles, atv's etc...Ddf