Can anyone identify this?

[cburgener]

Found this relic this morning. Best I can tell it says " turn register to simmer." I would guess it came from some type of an old stove. Can anyone identify? Thanks so much

 

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[releventchair]

It hints of a drain cover.

 

[OWK]

Old stove grate.

Old Cast Iron Pot Belly Wood Stove Burner Plate Grate Register Antique

 

[cburgener]

Awesome! Thanks for the info!