





Generally, one measures a watch's width directly across the face, excluding the crown (the part with which you wind the watch) by measuring just to the side of the crown. It tells you the size of the watch and the approximate size of the movement inside the watch.
The lugs are the protrusion from the watch case that are the attachment points for the bracelet or strap.
Watches today generally have spring loaded pins, called spring bars, which attach the strap or bracelet to the watch. Early wristwatches and many military watches had a fixed spring bar, that was not removeable. As wristwatches first became popular in the 1920s and 1930s, the technology for making spring bars was not practical or reliable, and miltary watch designers wanted to eliminate the possibility of losing the watch due to a spring bar failing. Thus, some spring bars are fixed. Ask your watchmaker if the spring bars are fixed.
We would love to help you identify and date the watch further. If you can obtain digital photos of the inside of the case back and the watch movement, it would be most helpful. Omega made identifying marks in several places to aid in identification, some of which have changed over time. In the era this watch seems to be from, this is what you are likely to see. I've posted photos of an example of a gold cased watch from 1926 (Omega didn't change this system often. Note this watch has a hinged case, which yours does not).
Inside of the case back:
-- Omega logo in a generally circular shape
-- indication of the case metal, perhaps acier Staybrite or inoxydable, which is stainless steel and a brand name of stainless steel (my example is "14K 0.585" indicating 14k gold.
-- a seven or eight digit number, which is a case serial number (and is not the same as the movement serial number)
On the movement:
-- Omega logo in script
-- number of jewels (almost always, although my example does not have it)
it may (but not always) say "unadjusted" or "adjusted in X positions"
-- a seven or eight digit number, which is a movement serial number (and is not the same as the case serial number)
-- hidden underneath the balance wheel (the circular piece which rotates back and forth) will be an Omega code for the movement.
This one is 23.7 T1.
Don't worry if your photosdon't turn out well and you can't get close ups. An in focus shot from further away is far more helpful than a blurry one close up. We all struggle to get photos that show what we see on our wrist, let alone the microscopic details of the inner workings of our watches.
Good luck