Help, Seminole War Fort area find. Any ideas?

[EagleEye1]

I may be waaay off, but I found this at a well known Seminole War Fort area (US Military) and via a quick google search, appears to look possibly like a ball shot starter or something similar (I don't know zilch on muzzel loading guns).

Any ideas?

 

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[GB1]

old radio battery

 

[EagleEye1]

old radio battery

Okay, thank you. Any idea on the era/time frame?

 

[GB1]

I think maybe 1930's-1950's but I'm not 100% sure

 

[Digger RJ]

Nice!!! Congrats!!!