This is the 1953 issue of 3d Green and 3 1/2d Red Food Production Definitive stamps. CV ~$17

The stamps are in fine mint condition with great perforations and excellent centering. See first scan. 

Individual stamps are in mint, lightly hinged condition. Se-tenant strips are mint unhinged.

The back of the stamps have very clean, smooth white gum, no toning spots, with six hinge remainders/marks.  See second scan