Approx 9-1/2" x 11-1/2" (outside measurements) antique cast iron / metal floor grate / vent with fancy - decorative design / pattern. It has adjustable / movable flaps on the underside for opening / closing and these still work - move. The reverse of the grate is marked as S. M. & F. Co. Milwaukee, Wis. This grate is for a floor opening of
8 x 10.
It is very dirty and there is rust in places.
You be the judge of condition by the photos.
This is a really nice architectural item for your home remodeling project.