U Head-Stamp Small Bullet Casing?

[Depths Of History]

I found this bullet casing at a homesite that was built in 1890. Any ideas on the age of this casing? It was near a civil war area but I think it'd really old! What do you all think?

Thank you all!

 

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[nsdq]

Union Metallic Cartridge 22lr . not sure of year but looks like one i have cira 1920ish

 

[trdking]

Union Metallic Cartridge 22lr . not sure of year but looks like one i have cira 1920ish

If you measure the cartridge diameter in millimeters and thousands It will help date the cartridge. They made calibers close to .22 that were obsolete in favor of .22 rimfire. Union Metallic Merged with Remington in 1911 and discontinued the U a while after. They were making odd millimeter calibers as early as 1863 but not prior.

Cheers

 

[Depths Of History]

Thank y'all