Yes those All Guard/Conquest cases do look similar to the Seamasters from the same time period. Very nice SM by the way...love the stainless cases with the gold dial furniture, a real looker!!!
Old pics but it is on the wrist today. From 1966 - it should be perfectly paired with a high revving SAAB Monte Carlo or Sonett two stroke.
This just arrived two hours ago! I posted another thread with pics and a video/audio of the alarm here: http://omegaforums.net/threads/wittnauer-alarm-just-arrived.18739/#post-202368
No, I've had this for awhile, Ed. It was my first Nomos. It's the smallest (36mm) of the Club models.