Haven't a Clue

[Houdini48]

Found these on a private military beach. Very low volume. The 1/2 round items (3) appear to be brass.

 

[Fat]

... Hello, is there more than 1 piece? I’m easy to confuse, is there more than 1 brass part?

 

[smokeythecat]

I think they are internal timer devices to old artillery rounds. We found similar ones in Delaware.

 

[invent4hir]

Since you found 3 on a private military beach, smokeythecat is probably right. At first I thought it was part of a pocket watch movement. Is there any lettering on it?

 

[pistol-pete]

It's the back plate from a pocket watch, you can see cut outs for gears etc.

 

[pepperj]

Pocket watch parts