What's the difference between 30t2pc and 30t2sc ?
Here is the family:
To help to remember: PC = "protection contre les chocs" (shock protection), SC = "seconde centrale" (sweep second).
WhAt came first ? The pc or sc , or at the same time?
The two features were independent. Some had PC, but were sub-seconds (not SC), some were SC, but had no shock protection, some had both and some had neither.
Once Omega renumbered their calibers in the late 1940's, the "SC's" became cal. 28X and the sub-seconds became cal. 26X.
By that time, all of the 30mm movements had some type of shock protection, so the PC notation was obsolete.
Clear as mud, right?
Let me ask this:
Could a cal. 491 be cased with a back that had the "SC"? Just to refresh your memory this caliber has seconds on the bottom.
I wouldn't think so unless the case back was incorrect. As noted the SC designation refers to a watch with centre seconds...
That's essentially what I'm asking - is the back incorrect?. I was sold a watch, my noob tax, and when I accused the seller of misrepresenting the watch as "authentic" because it had a caseback marked SC with a SOB movement.
I would think it's a replacement
Haha Yepp as always thanks!
The cal 28x has to be more common right?
I se a lot of them ,
But not a lot of 26x ,
It depends on the time period. I think the later you go (up until 1964, when the 30mm series was totally discontinued), the higher the percentage of cal. 28X.
But I really don't know the production figures. This is just my observation.
There were not less 26X. There were about 2 880 000 watches produced with one of the 30 series. And there were 728 000 watches with the 265 or the 266, and 264 000 with the 267 (Omega Muséum source). To compare: 217 000 with the 283, the most used of the 28X series.
And the 28X were even 30TX PC SC AM (antimagnétique)! A number such as 280 was actually simpler...
Thanks for all the info, good to have some backup
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