I'm wondering what 50's/60's models have 36mm cases? My wrist is too large for a 34mm and that seems to be the most common size from this period.
There were a few Constellations from the 60's that were 36mm. 168.004 and 168.010 might be the reference numbers.
166.032 or 168.028 Seamasters are both a comparatively massive 37.5mm. Pretty big for a '60s piece. Mine, recently acquired: