Hi!
I have seen several "Troy-Lemania" around. Including regular timers. Having local companies on your side was often an advantage when fighting for military/gov. contracts. My best guess is that this is the main reason for the Troy connection in SA.
Omega and Lemania was, together with Tissot and others, in the same group of companies from the 1930s up into the 1980s.
https://en.wikipedia.org/wiki/Société_Suisse_pour_l'Industrie_Horlogère
Lemania was sold off in the early 1980s as a part of a plan to save the group from bankruptcy following the "quartz crisis", and the group later formed the basis of todays Swatch Group.
To your main question:
During the times within SSHI, Lemania made all chronorgraph movments, and most completed chronograph watches for all the brands within the group, Omega included.
Omega did not have any "in-house" chronograph production until later (caliber 861 production equipment was transferred to Omega at some point in time after Lemania was sold off during the 1980s.
For tool/military watches there are several examples of dual references. The same applies for a few civilian models as well.
Most cases was exclusive for Omega, Tissot or Lemania, but some was used for all.
After Lemania was sold out from SSHI, Lemania was seemingly left with stocks of various cases and movements. I have a couple of examples where Omega brands have been ground out, and Lemania references added. Same case, but as the companies was at that time no longer within the same group, any ties had to be removed prior to sale. Times was hard in Switzerland during the 80s....
Cheers!
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