Any ideas no clue cast iron valve

[matthewc61]

Found where old store once was in the 1800’s .
Was told may have been a cotton gin at this site.
Curious if this old or modern. I used a grinder to remove rust off. Any clues would be appreciated.

 

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[creskol]

It reminds me of the top to an antique string/twine dispenser like was seen in old stores.

 

[matthewc61]

Looking now, it is cast iron , has that raised area and small grooves on either side of the raised piece near where my thumb is in first picture

 

[matthewc61]

Could this be some type of vintage pressure relief valve?

 

[ticndig]

it's not a plumbing pressure relief for sure. it's not anything plumbing related . I like the twine dispenser idea. used so long it wore a notch in it.