Found this while digging bottles....no idea what it is

[Minrelica]

The thread title says it all.

Anyone?

THX - WIT

 

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[Tubecity]

It seems there is a thumb-tab on one side & the other side mounted in a track to slide
back & forth. How about a flue or vent part from a old heating or cooking stove ?

 

[Ice_Water]

Could be a crawl space vent.