This is an unusual one. It consists of a three piece case, movement holder and case tabbed case back. You turn the case back to release the tabs then push out the movement holder from the top. The arrows are where the tabs are. It is stainless but has no serial number. The movement is a 11OACB with an N3 date code. Inside the case back says "M.R.P. 7317 Swiss Stardal Brevet 506 829 and what looks like MMSA." The dial is a brushed vertical striped champagne dial with a Day/Date feature and a pull out quick set date. It is an extremely large watch. This watch I ID'd as a 1973 Minute Man based on this 1974 ad.
Case Serial No.
No Serial Number