Most vintage gold 'plated' or capped vintage Omegas are more than 200 microns. In the later 60s and 70s some, but not all, were gold plated and it really showed, the plated examples not really showing the depth of the 14k plaque or capped modles.
There was, however, a 20 micron gold Mk 11 speedmaster produced in 1972. It had the maroon tachy under the crystal, and looked very nice as a 'dress' piece. Why not trawl for one of those?
Cheers
Desmond,
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