✅ SOLVED Metal Thermos/food container lid? or machinery cap?

[frojones]

First off, I am new to metal detecting and I would like to say hello to everyone! I dug this strange thing up yesterday and thought it was maybe a tiny bowl with feet, until I cleaned it up and saw the threads. It is about 2.5" in diameter. One friend thought it may be a cap from some kind of Caterpillar machinery, another said a cap for an old mining lantern, and another said it was the lid to an upside down food/drink container. Off hand I don't remember what conductivity it registered when I hit it. Any suggestions? Thanks!

 

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[Lafitte Deux]

That's a Model T radiator cap.
Sometimes called a "dog bone" cap.

 

[frojones]

Ohh fantastic! Thanks so much for clearing that up for me! You rock!

 

[nhbenz]

Correct on the ID, but I think the "dog-bone" is the type with two little handles off on opposite sides, while this is a "high fin" cap.

 

[Pointman]

Oh, thanks also. I now know what it is that I found last year.