I'd agree there alright CF. Total minefield of NOS 40-50 year old watches... Actually on this point, they were. Though they weren't advertised 1550 SG's could be sourced special order through dealers at the time. Rarely though as before the interwebs, jewellers wouldn't have them, no advertising, so few would even know they existed. I've seen a few with original owner provenance down the years that were "civilian" examples(all small "T", small Heuer logo, no (3H) and no issue stampings). My own example is one such.
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