2F50c RED - A WORKING PLATE PROOF:An imperforate block of ten (5 x 2) being the lower two rows of the sheet with various "punched" holes and ms "Plate colour/29.9.44", "AL/56589/100000 stamps/=2,000 pulls" and "Wording & lay correct/29.9.44". Some marginal creasing. Scarce. (Image)