That is true. The first 2 Models were also used by other companies, (Lemania, Alpina, Wyler, ...) but the third one was never used by OMEGA!
If you look at the gold plated one you will most probably find a smal OMEGA stamp. But it was used as you said for Alpina.
The lemania alarm 2980 in 18k gold you show I missed. Unfortunately, as i regularly check for Lemania 2980 and I still can not find it yet. Would you have a link? or the price it sold for
Luckily I have one with the number 3160592 ;-)
The story the collector told me and which I am inclined to belive is that it was sold to the shop in Lausanne (Switzerland) by the widow of an Lemania manager. Very few were made. But there was a model with this case also for Omega 166.106 or BA 1660106
A pic is on the Omega museums site.
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