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Denver Dick · 31 December 2009, 11:59 AM

I just purchased a 6 month old 36mm Railmaster from a TRF member. It has the 2403B movement. I've read about the 2500A, B and C movements, but what about the 2403A and B movements. Does the 2403B run at 28,800 or the 25,200 BPH? Thanks.

Tools · 8 January 2010, 05:19 AM

The early Railmasters that came out with the 2403A movement beat at the typical 28,800 BPH of it's base ETA 2892-A2. The 2403A was the same non-date movement as the Date version 2500A Co-Axial movements found in other Omegas such as the Planet Ocean..

This proved to be too high a frequency, and it is likely that Omega felt that the Co-Axial would not live up to it's "enhanced lifetime" claims. The beat in subsequent Co-Axials was reduced to the now familiar 25,200 BPH.

The latest Omega Co-Axial movements, the 2500C, the 2403B, and the new 8500 all have the same 25,200 BPH tick...

Denver Dick · 8 January 2010, 05:23 AM

You da man, Tools. THX

ROGERB · 9 January 2010, 03:37 AM

Does anyone know if during a service the beat can be changed from 28,800 to 25,200BPH ?

31 December 2009, 11:59 AM	#1
Denver Dick "TRF" Member Join Date: Oct 2009 Real Name: Wayne Location: Ventura County CA Watch: TT DateJust 16013 Posts: 428	Question re the 2403 movement (Railmaster) I just purchased a 6 month old 36mm Railmaster from a TRF member. It has the 2403B movement. I've read about the 2500A, B and C movements, but what about the 2403A and B movements. Does the 2403B run at 28,800 or the 25,200 BPH? Thanks. __________________ Rolex DateJust 16013 Omega Railmaster 2503.52

8 January 2010, 05:19 AM	#2
Tools TRF Moderator & 2024 SubLV41 Patron Join Date: May 2007 Real Name: Larry Location: Mojave Desert Watch: GMT's Posts: 43,492	The early Railmasters that came out with the 2403A movement beat at the typical 28,800 BPH of it's base ETA 2892-A2. The 2403A was the same non-date movement as the Date version 2500A Co-Axial movements found in other Omegas such as the Planet Ocean.. This proved to be too high a frequency, and it is likely that Omega felt that the Co-Axial would not live up to it's "enhanced lifetime" claims. The beat in subsequent Co-Axials was reduced to the now familiar 25,200 BPH. The latest Omega Co-Axial movements, the 2500C, the 2403B, and the new 8500 all have the same 25,200 BPH tick... __________________ (Chill ... It's just a watch Forum.....) NAWCC Member

8 January 2010, 05:23 AM	#3
Denver Dick "TRF" Member Join Date: Oct 2009 Real Name: Wayne Location: Ventura County CA Watch: TT DateJust 16013 Posts: 428	You da man, Tools. THX __________________ Rolex DateJust 16013 Omega Railmaster 2503.52

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9 January 2010, 03:37 AM	#4
ROGERB "TRF" Member Join Date: Nov 2007 Real Name: Roger Location: WHITE ROCK BC Watch: 89 16610, 57 7914, Posts: 897	Does anyone know if during a service the beat can be changed from 28,800 to 25,200BPH ?

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