is this a key handle

[john46]

11cm long

 

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[DCMatt]

Possibly a gaslight key. Can you give us a good shot of the business end?

DCMatt

 

[vhs07]

Since it flares out at the bottom, I'd say something on the line of this:
Your's looks to have a rusted square nut attached to the end.

 

[fowledup]

If the end is hooked my guess would be a vintage Paint can opener

 

[sutphin]

I THINK MAYBE A KEY

 

[Back-of-the-boat]

It looks like it is two different metals as the bottom has rust going on. The bottom part could be a steel bolt and the top part brass.