Civil war?

[Tbecktwo]

Found this on a farm amongst some civil war bullets, a cannonball fragment, and a buckle. All within about 30 yard radius. Could be modern, but it was at about the same depth as the bullets, etc. Any ideas? Thanks

 

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[vhs07]

What's left of a pressure gauge.

 

[Tbecktwo]

Thank you!

 

[maxpower]

3 speed bicycle gear changer?

 

[Charlie P. (NY)]

Agree with pressure gauge (or altimeter)

 

[Tbecktwo]

Thank you all for the responses. Solved!