I bid in two Hamilton Model 17 (bar over crown) cases, complete with crystals. I will replace the case which has a name on the back, and store the other for use if I get another good 992B with unsightly case.
These cases don't appear on 992Bs for the Canadian market since the movements were sold in tins to be cased in Canada.

Dunno about cross border shopping for watches in 1940-1970, but I imagine it was not too uncommon.