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Omega 2500 Co-Axial movement? >>

<< Hi all, as I was posting earlier, I just picked up a new 45.5 PO. Is it just me, or does this movement beat a bit slower, compared to the 1120?

Also, how would I know if I have a 2500 B or C? Does it matter?

Cheers,

Rich Me: Rolex Y Series 14060M; Rolex D Series 16610LV; Omega Seamaster 45.5mm PO 2900.51.82; ML Pontos Petite Seconde Manual Wind; Tissot Seastar 1000 Automatic; Swiss Army Ambassador XL Manual Wind 24151; Swiss Army Ambassador Automatic 24150; Swiss Army Infantry Quartz 24656; Hamilton Khaki Navy Frogman Titanium Automatic; Hamilton Khaki King Automatic; Hamilton Khaki Field Mechanical Officer; Movado Classic Museum Quartz w/ Lizard Strap; Seiko "Black Monster" SKXA43; Invicta 8926; Invicta 3044; Invicta 2625; Casio G-Shock 2688; Orient Multi-Year Calendar Automatic; 1970-1974 vintage Wittnauer "2000" Series Automatic - MINT; various other watches...
Answer:
versus 28,800 for the 1120. That was one of the improvements made to the 2500C over the 2500B. (All PO's have the 2500C movement in them)
Omega f300 Tuning Fork, Omega Speedmaster Professional "Snoopy Award" Limited Edition 3578.51.00, Porsche Design by IWC 3702, Omega Seamaster CK 2518 (c. 343), Breitling SuperOcean Steelfish A17360
Answer:
Me: Rolex Y Series 14060M; Rolex D Series 16610LV; Omega Seamaster 45.5mm PO 2900.51.82; ML Pontos Petite Seconde Manual Wind; Tissot Seastar 1000 Automatic; Swiss Army Ambassador XL Manual Wind 24151; Swiss Army Ambassador Automatic 24150; Swiss Army Infantry Quartz 24656; Hamilton Khaki Navy Frogman Titanium Automatic; Hamilton Khaki King Automatic; Hamilton Khaki Field Mechanical Officer; Movado Classic Museum Quartz w/ Lizard Strap; Seiko "Black Monster" SKXA43; Invicta 8926; Invicta 3044; Invicta 2625; Casio G-Shock 2688; Orient Multi-Year Calendar Automatic; 1970-1974 vintage Wittnauer "2000" Series Automatic - MINT; various other watches...
Answer:
As Downtown Mike said, all POs have 2500C, which beat at 25.2K bph. while Omega cal.1120 & cal.2500B beat at 28.8K bph.

I wouldn't call it "improvement" from 28.8K bph to 25.2K bph, except in the power reserve. My guess about Omega's moving to 2500C is that using slower beat rate may help to relax the tight tolerance required for Co-Axial movements. The difference between 2500C & 2500B is minimal, and not noticeable by the end user.

mjb
Answer:
I believe they lowered the beat rate because the co-axial escapement ran more efficiently at a lower rate.


Andrew
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