What type of screw is this? Age?

[bartshop62]

What type of screw is this? Age? What type of metal is it copper or brass? Or something different. In picture 3 if you see its threaded. What was it used for?

 

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[bowwinkles]

Looks to be a lamp shade holder top.

 

[Tony in SC]

Could also have been for a lantern shade.

 

[HuntinDog]

It looks like rusted iron, but that could be the patina. See if it sticks to a magnet.
Lamp finial or something like that is a good bet.

 

[vhs07]

Looks like a piece from one of these..