Brass piece from 1800’s cellar hole site

[pa-dirt_nc-sand]

There was some old wood sandwiched under the washer when found. My thought is an attachment for a buggy, any ideas?

 

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[Rmeav8r]

I might be way off here....but my first thought was that it was a propeller trunnion from a vintage model airplane engine that had a wooden prop. The trunnion tightens with a spanner wrench and the wood prop is held with a machine screw or bolt. It might be a smaller example perhaps. Similar at least...just a thought.

 

[DCMatt]

Maybe a mount for a crank handle. Like for a coffee grinder or a pepper mill or even a box phone.