Nice catch, and following! I also have a 1950 Hetchins, same lugs as yours but with vibrant stays ( previously posted). The seller from whom I acquired the frame identified it as a Nulli Secundus, not the Super Special, but hetchins.org indicates 1950 was a transition year and it could be either. Apparently there were a few NS frames that year with integrated headsets, which would otherwise be the defining distinction. It seems to come down to how it was entered in the bill of sale that year - which I don't have so I'm fine with the seller's ID. Either way it's a Hetchins.
I continually pick up unexpected info on the forums, mine came with the CL head clip intact so I was unaware of the size differences.
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Last edited by PilotFishBob; 10-09-23 at 05:53 AM.
Reason: Clarification