Re: Superb

Ed's Denim is clearly labeled "54" in ink -- indicating it's a 1954 production run. AFAIK, by 1954, this (the "BD" cut) was pretty much the only style issued.

Your denim is labelled 1940. Again, AFAIK, there were at this time TWO styles of of denim over garments of this type -- those patterned after battledress, and the ones patterned after the earlier service dress.

Just a guess, but perhaps that is the reason your's have a differenciating model number, and Ed's don't.