The Nikkormat EL series, however, has a flash sync mode switch in the shutter speed dial.
I have no doubt about the labelled Nikkormats EL (the EL and ELW), but the later Nikon EL2, technically an ELW with the AI system, doesn't have that switch.
It always amuses me to see how Nikon introduces "new features", sometimes undetected, others more blatantly obvious, like when the G series lenses were precluded by more than 10 years before their introduction when Nikon released a camera that didn't needed an aperture ring. In this case, the F401.