Ident. Found in 2 foot proximity of late 18th century Royal Navy uniform button.

[Jonbrown22]

About 3 inches long and has a tapped hole in the bottom about 3/4 inch deep.
Flag staff topper?
Sword pommel?

 

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[ARC]

Possibly a lamp or drapery finial.

I would lean toward the latter.

 

[Professor of Engineering]

Interesting relic, congrats!

 

[Digger RJ]

Nice!!! Congrats!!!

 

[CRUSADER]

More like bed post or furniture.