Here's another one for the database - I haven't seen this one in stainless steel. Accutron calendar, sometimes called "Sputnik." It's the only Accutron I have that doesn't have the standard 11/16 inch distance between lugs - this one needs a 22mm band. One of only two watches I own with a "Safirglas" crystal. I have seen other models of this same case, but have never seen the word "Safirglas" on the dial.
Movement Serial No.
Case Serial No.