Some type of brass hardware

[JM1184]

I have no idea what this item is , some type of hitch ? The knob is threaded / screws off. The only marking is a B on one side , appears to be stamped. It's length is around 5 inches

 

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[Bruce R]

Looks marine

 

[digging440yrs]

Yep, I was thinking oar lock myself

 

[JM1184]

thanks , now that you mention it , it definitely does

 

[cudamark]

Or maybe a light pivot?