The Gray-Backed 1952 Topps cards, sometimes referred to as Canadian in origin (which they are not) all fall in the third series (#131-190) and persist as a tough subset to collect. This PSA 1.5 of the Yankees Charlie Silvera has a scuff mark, fairly large, in the lower left quadrant, a crease running North from the bottom border through the nameplate and some chipping on the obverse.  The back is a bit nicer in appearance.