Can anyone idetify this please?

[hurt.ronnie]

This item is round hollow and has 1 groove towards around the opening. I Know it is copper. But do not know origin.

 

[kingskid1611]

looks like a copper bead.

 

[Peyton Manning]

I would expect beads to have a through hole

 

[rick67]

I would say Ball Button and it could still be but not definite.

 

[relic nut]

Maybe a knob off of a pull chain. Like on a light/lamp

HH, Relic Nut

 

[Anduril]

A press-fit end for a curtain rod, or similar. ??
In other words, a decorative finishing piece.

 

[Icewing]

Is it threaded on the inside?

 

[stefen]

Similar to the knob end of a an old faucet handle

 

[digger460]

If threaded on inside, it may be a nut for a ceiling light to hold shade. Example:

 

[ARC]

I am agreed with those who say lamp part.

 

[ivan salis]

a seal for a gas pipe the ball joins two pieces of pipe on the inside of a hollow threaded joining nut and presses against the sides making a seal ,,,

 

[DCMatt]

I would say Ball Button and it could still be but not definite.

Agree. Ball button with the back/shank missing.

DCMatt