An older Griswold 4inch stove damper P/N 523 in impeccable shape – doubt you could find a better example.
Marked (side 1) “GRISWOLD, 523, AMERICAN, 4 IN” (side 2) “REVERSIBLE, PAT’D July 20, 1915., STEEL SPINDLE”.
This is definitely an older one from before the design of the coil handle.
Handles and nub are wood. As always cleaned and seasoned.
A cool little collectors piece.