Another whats-it

[CoilToTheSoil]

No clue on this one. Found on an old site with items dating into the early 1800s and has been in my random pile for awhile.
Any idea?

 

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[villagenut]

Part of an umbrella or parasol

 

[digger dug]

looks like part of an old cap gun

 

[Kray Gelder]

Part of an umbrella or parasol

Agree on that.

 

[CRUSADER]

Part of an umbrella or parasol

yeap

 

[ConceptualizedNetherlandr]

Lock washer

 

[Bruce R]

looks like a hub from a spoked toy wheel, the wood rotted away.