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When you refer to 'original case style' are you referring to the dogleg case?
(The pie pan dial first appeared in lyre lug cases in the 50s)
You have a nice version of the .004.
There is a thread somewhere about this style of 'painted pie pan' and IIRC the conclusion was that on some the outer dial edge is indeed faceted and so is a true pie pan, whereas on others it is a trompe-l'oeil paint effect to replicate a pie pan dial ( you will have to look at the dial in-hand to judge )
They do also come in the sharper-edged 'regular' pie pan dials you refer to.
If you like this style, you could also try the very similar 168.010, which due to the wider lug spacing wears slightly larger than even the .004 (and they also come with pie pan dials)
Painted markers on this reference. Here’s some chipping in the paint on 5 o’clock marker.
I’ve never seen one with onyx, even on gold cases. Omega cost cutting in late 1960’s.
gatorcpa
I searched on this "rainbow oxidation", but hardly found any relevant info on that ; is it really sought after ?
OK thx ! I didn't know about the silver coins, and I also do not like this oxidation on watch cases ; I also have a couple of interesting vintage silver pocket watches, and I much prefer them nicely polished.

The two on the right have original beads of rice bracelets. The one on the left as an aftermarket bracelet that is actually fairly close to the factory bands for Seamasters