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: I'm attached to both watches, Pro 2535.80 has a
: higher 'caliber' and its newer (improved?)
: watch.
No, that is an incorrect interpretation. They are essentially the exact same watch except for cosmetic differences in the face plus one has the GMT feature while the other has the useless Helium Relief Valve.
So the only REAL factors to use to choose between them are: is the GMT feature important to you -and- which you like the look of better.
: And what's in the 'caliber'?
Caliber is merely the model/part number of the mechanism inside the watch. This surprises a lot of people, but the same mechanism is often used in a variety of different watches. The 1120 in the Seamaster Pro is also used in many DeVille and Constellation models. With only minor modifications, OMEGA can add a feature like GMT or a Coaxial escapement to make a 'new' calibre for a different watch -- while still using 90+% of the same mechanism.
The 'caliber' is NOT a higher is better concept. The mechanism inside the GMT is almost exactly the same as in the Pro except for a small modification to add the GMT function. Neither is better or improved over the other -- they are exactly equal on accuracy and reliability.
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