✅ SOLVED Take A Shot At It

[rick67]

Never seen one of these. Appears to have a trigger.

 

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[Tony in SC]

Heater control for an old car?

 

[john845]

It looks like door hardware.

 

[Joe-Dirt]

I’d say trigger mechanism for a kids toy rifle or a cheapo black powder rifle

 

[Terry In Florida]

an old valve and bypass?

 

[rick67]

Marking as solved.
Used electrolysis over night. Definitely a trigger not a thumb latch, made cheaply.