Congrats, very cool vintage Omega, and I didn't imagine the Extract of Archives cover also that period!! I had a EOTA from years '40, but 1915?! that's amazing
Here is another one of my very old Omega watches which I sent away for an extract of the archives to Omega because it has fixed lugs to the case. I basically wanted to find out if this was a watch that left the factory as a wristwatch or it was adapted from a pocket watch. You will see from the archives that it has watch type as pocket watch. The case on this one is around 35 mm excluding the Crown. I also have another identical one with a case number of 3 million and that case being slightly bigger at 36 mm excluding the Crown. Both dials are nearly identical and the porcelain/enamel on them is a very stunning ivory colour and not pure white.