Weird looking lantern part possibly or maybe not a lantern part

[bartshop62]

Found metal detecting in American civil war battle area and where American civil war relics found. What could it be. It does not stick to the magnet. How old is it?

 

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[ToddsPoint]

It looks like the top of a can with a screw on lid. Gunpowder maybe? Gary

 

[ARC]

 

[bradyboy]

thermostat
brady

 

[DCMatt]

Talcum powder tin top. Early - mid 20th C.