my mistake, looking again at the 1963 catalogue it is only the standard QR vice that has the cover. The 'D' model (the one with the dog in the front jaw) does not. I have never really looked into what happened to the design after the merger with Ridgeway and subsequent acquisition by Irwin but I suspect the cover was probably dropped in the late 70s/early 80s. Can you even get a modern copy with the screw and nut cover?