1933 had oly the drum type spare tire cover. The 1934 Master used the same cover for rear spare or side mount tire covers. The 1935 and 1936 Master shows a different cover for side mount covers......but had no emblem on it. I would guess it is a 1935-1936 side mount cover with an added emblem.
The metal tire cover depicted above is definitely not for 1933 or 1934. My accessory catalogs for 1935 and 1936 show a metal tire cover that is different than the one featured in the photo above. There are no metal tire covers listed for 1937 thru 1940 in my accessory catalogs and parts lists.
The metal tire cover shown above is not Chevrolet and it is for another brand of vehicle, possibly a Chrysler product, and someone attached the Chevrolet emblem.