Helping a friend here. How should a crown for a 105.012 look? There is a replacement crown ST43018 that i can see .But does that have the right look in the Omega logo? The crown is 7 mm ? Guess they är really hard to find?
105.012 should have the old logo. Suitable crowns are still available new but with the new logo. If you want it to look period correct you'll need either scour ebay for a period correct one, or occasionally a member here modifies new Railmaster crowns (which I believe are available with the old logo) with a Speedmaster stem.