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The original SM 300 is slim and handsome, and not a brick with unnecessary gimmicks like a date window...
The original SM 300 is slim and handsome, and not a brick with unnecessary gimmicks like a date window...
Or a fart valve
You need to educate your self: https://omegaforums.net/threads/big-problem-with-helium-escape.39163/
The HEV is mission critical to us high stakes action Seamaster owners. Yes you may call us Bond types we dont mind.
I welded my SMP's HEV shut, that way the helium cannot escape. But then I realised the crown was also a point of leakage, so I had to weld that shut. Unfortunately, then I realised that while the Caliber 1538 keeps good enough time that the crown is not needed, the date wheel would slowly drift - so I covered the crystal at 3 o'clock with blu tack, which is an approximate colour match to the dial. The only issue now is that I will have to throw the watch away at the next service interval, but fortunately there is a reasonable second hand market for my reference.
Can't understand why Omega didn't design it this way from the factory, frankly.
Any competent watch maker might disagree, but I dont think welding is the way to go. Helium is the second smallest atom we know so it can leak trough a poruos weld. Have you considered any of the other inert gases? Argon and Neon are both lighter than air, but you would still have the problem of the higher density than Helium making your watch feel heavy on the wrist.
You could use a tear of calendar in stead of the blue tack, or maybe drill and tread a hole to fit a date adjuster from a day-date. Any competent watch maker will be able to do this job for a reasonable price.