Heavy well made WearEver aluminum pan, made to do double duty as a roaster
tray under large cover, or a baking pan.
This is about 17" - 18" across the handles, about 14 3/4" x 10 1/2" over the pan interior. Looks to us like it's probably a fit to an 818 / 918 roaster.
It's used, and shows scratching and wear. It's nice and flat, and heavy enough to use as a griddle. Nice!