Let's try to continue with other watches presented in this thread :
In X350 XJR's post page 2 :
First picture shows side by a side a 26.5SOB ref CK615 (I already posted catalog pictures and mine above) and a R17.8 ref CK3871 (here in the Omega Vintage Database :
http://www.omegawatches.com/planet-omega/heritage/vintage-omegas/vintage-watches-database?ref=14856)
Second picture shows a R17.8 ref 9797 (see AJTT p.140), détails on OVD here
http://www.omegawatches.com/planet-omega/heritage/vintage-omegas/vintage-watches-database?ref=19454, and a 26.5 for which I couldn't find the reference, but I have one in my collection (sorry for the quality of the picture, I couldn't do better) :
Third picture shows a T17 ref CK 730, here in the 1939 catalog :
and a R 17.8 (?) unidentified.
Fourth picture shows a R17.8 ref 3813 (AJTT p.141 and OVD here :
http://www.omegawatches.com/planet-omega/heritage/vintage-omegas/vintage-watches-database?ref=14858.) and a cal 302 ref N6526 (see AJTT p. 152).
Fifth and sixth pictures show watches I couldn't identify. The one with articulated lugs could be a T17(?) with custom case(?)
Seventh picture shows a 26.5SOB ref CK 2023 (I already detailed it above) and a R17.8 ref CK 2461 (see AJTT p. 148)
Eighth picture shows a 26.5 SOB T3, also shown p. 135 of AJTT (ref is not indicated, which is unusual in this book). Here is mine :
I don't have the ref but it also existed with a 23.4SC Inside :
The last golden one is too dificult to identify without knowing which caliber is Inside, cushion cases were produced during something like 40 years by Omega.
I hope I was not too boring...