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How to tell which 2500 movement you have?

SunTiger
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Hi everyone. I was doing some research on the accuracy of my watch (Bought 2010 Seamaster Professional 300M) as it has been 10 years now, and have not had it serviced. I am planning on do it soon (by the end of the year, once the COVID-19 mess has settled a bit more as the Omega AD said right now its about 3 possibly 4 months wait time!)

So, it got me thinking "I wonder how accurate my watch really is" I never have cared before.

Anyway, I have set it with time.is website (is that a good idea) and I can see that so far not even a full 24hrs has passed and its already 4-seconds slow. I know, for this test to be accurate I need to wait many days / week etc. So, we will see.

Regardless, I also read there are several versions of the 2500c movment. A,B,C,& D. I was just curious as to how I could figure out what I have inside my watch? Is there a way to tell by the serial number? Or, the year?

Thanks guys!
 
padders
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I think only the 2500C and 2500D were used in the SMP, versions A and B came earlier than the 2008 introduction date and were seen in the DeVille etc. I think the D is only seen post ~2012 so I would expect yours to be a 2500C. In the case of Planet Oceans you can tell which you have from the date wheel font, not sure about the SMP. It is also possible to tell from serial number. I had a late 2500C Planet Ocean on ~85m serial. Not sure when (if at all) the D was rolled out on the SMP but I would hazard that you would need a serial higher than this to have one.
 
SunTiger
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You are exactly correct. A very nice man on this forum, that I PM'ed was able to take my serial.. and confirmed it was in fact a version C.

Happy it is not the early versions.. but, sad it was not the latest D. lol.
 
SunTiger
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BTW.. Can anyone confirm.. what year was the 2500 C movement stopped for production? Omega says they will supply parts for at least 20-years after.. so, I was just curious.
 
Jking
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padders padders
I think only the 2500C and 2500D were used in the SMP, versions A and B came earlier than the 2008 introduction date and were seen in the DeVille etc. I think the D is only seen post ~2012 so I would expect yours to be a 2500C. In the case of Planet Oceans you can tell which you have from the date wheel font, not sure about the SMP. It is also possible to tell from serial number. I had a late 2500C Planet Ocean on ~85m serial. Not sure when (if at all) the D was rolled out on the SMP but I would hazard that you would need a serial higher than this to have one.

actually my 2009 aqua terra has a 2500c movement in it also...not sure If it was used outside of the seamaster family though.
 
OmegaFan503
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A good way to tell if it is a 2500D is to take a look at the date wheel. If the number 4 is pointed at top, then it is a 2500D. If it is flat, then it is a 2500C or earlier I think.
 
ExpiredWatchdog
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BTW, minus four is nothing to be worried about. But all the same, a ten-year old watch is in need of a service.
 
Archer
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OmegaFan503 OmegaFan503
A good way to tell if it is a 2500D is to take a look at the date wheel. If the number 4 is pointed at top, then it is a 2500D. If it is flat, then it is a 2500C or earlier I think.

Please keep in mind that this is not 100% reliable. The date indicator can be changed to the D style on a C watch, so the only way to know for sure is to check the serial number on the Omega Extranet, or open the wacth and look directly at the movement to find out what version is stamped on the main plate.
 
SunTiger
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Thank you guys so much for all the tips! Archer.. you are a god on here! Yes, I was able to have the serial confirmed.. and the one I have is apparently a "C" version. I'm not going to loose any sleep over this (cant do anything about it anyway), the watch has been running pretty much non stop for 10 years, with no issues, and from what I can see still maintains accurate time within reasonable standards even with no service (which I am definitively going to do soon anyway).

The bigger worry that I have, is just keep this running for another 40+ years.. I want my son to own this watch one day. Hes 7 now, and already wants it LOL. Was worried about parts being avail that long from now. But, some of you have told me already that this is a popular watch / movement, and that its likely it will be still serviceable way into the future. From this point on, I will have it serviced every 5 years.
 
OmegaFan503
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Archer Archer
Please keep in mind that this is not 100% reliable. The date indicator can be changed to the D style on a C watch, so the only way to know for sure is to check the serial number on the Omega Extranet, or open the wacth and look directly at the movement to find out what version is stamped on the main plate.

Good point
 
avidmark
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Archer Archer
Please keep in mind that this is not 100% reliable. The date indicator can be changed to the D style on a C watch, so the only way to know for sure is to check the serial number on the Omega Extranet, or open the wacth and look directly at the movement to find out what version is stamped on the main plate.
My date wheel looks like the 2500D but on inspection of the movement, where it should say, it just says Omega and the logo. I'm puzzled.
Serial is 855xxxxx
Edited:
 
20210831_185838~3.jpg
Blackdog
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I have read somewhere in this forum that up to 2500C the version is stamped on the main plate, for version D is not.

Up to 2500C, the serial is stamped on the base of the balance cock (just above the "SWISS TWENTY-SEVEN" text, as in the following borrowed picture:

omega2500_1-800x800.jpg


On the 2500D it is stamped on the balance cock arm, like yours.
Also read that serails 8525xxxx and up are likely to be 2500D.
Edited:
 
avidmark
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Blackdog Blackdog
I have read somewhere in this forum that up to 2500C the version is stamped on the main plate, for version D is not.

Up to 2500C, the serial is stamped on the base of the balance cock (just above the "SWISS TWENTY-SEVEN" text, as in the following borrowed picture:

omega2500_1-800x800.jpg


On the 2500D it is stamped on the balance cock arm, like yours.
Also read that serails 8525xxxx and up are likely to be 2500D.
Ok, so all signs pointing to being the D version. But still a bit puzzling as my watchmaker mentioned it's not the D. Or maybe I misheard him. How do I confirm this?
 
Blackdog
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avidmark avidmark
Ok, so all signs pointing to being the D version. But still a bit puzzling as my watchmaker mentioned it's not the D. Or maybe I misheard him. How do I confirm this?
Or maybe your watchmaker is wrong...
With the serial and model number, Archer could possibly check for you.
 
Archer
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avidmark avidmark
Ok, so all signs pointing to being the D version. But still a bit puzzling as my watchmaker mentioned it's not the D. Or maybe I misheard him. How do I confirm this?

Well, looking at the escapement will tell you for sure. I would expect the watchmaker to know the difference between a 2-level and 3-level co-axial escapement, because it's pretty obvious.

I can check it if you give me the serial number, or you can call the closest Omega boutique and ask them to do it.
 
A
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16305234169439054423729223069173.jpg


Ask for a service card if you send yours in. Mine is a "c". Regardless of it being a c or d, we can at least be thankful it's not a Rolex 32** calibre.
 
M
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Archer Archer
Please keep in mind that this is not 100% reliable. The date indicator can be changed to the D style on a C watch, so the only way to know for sure is to check the serial number on the Omega Extranet, or open the wacth and look directly at the movement to find out what version is stamped on the main plate.

Archer Archer
Well, looking at the escapement will tell you for sure. I would expect the watchmaker to know the difference between a 2-level and 3-level co-axial escapement, because it's pretty obvious.

I can check it if you give me the serial number, or you can call the closest Omega boutique and ask them to do it.
Hi. I'm following this older thread, and have the same question - I have a 007 Seamaster 300m limited edition, black dial, 007 second hand, from 2008. I know it's a 2500, 27 jewel, but even Omega/Swatch is unable to tell me what version of 2500 it is. Is it possible to determine this from the serial #, and if so, how do I go about doing this? Version A,B,C,D?
Thanks!
 
padders
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If the watch is from 2008 then it is 100% version C. Read back and there are date ranges above. Versions A and B were not used in the Seamaster Professional 300m. There is no conversion possible, so it started life as a C and still will be.
 
Archer
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M magiclens
Hi. I'm following this older thread, and have the same question - I have a 007 Seamaster 300m limited edition, black dial, 007 second hand, from 2008. I know it's a 2500, 27 jewel, but even Omega/Swatch is unable to tell me what version of 2500 it is. Is it possible to determine this from the serial #, and if so, how do I go about doing this? Version A,B,C,D?
Thanks!
Post the serial number and I’ll check it for you.
 
R
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M magiclens
Hi. I'm following this older thread, and have the same question - I have a 007 Seamaster 300m limited edition, black dial, 007 second hand, from 2008. I know it's a 2500, 27 jewel, but even Omega/Swatch is unable to tell me what version of 2500 it is. Is it possible to determine this from the serial #, and if so, how do I go about doing this? Version A,B,C,D?
Thanks!
I have the same one, it's 2500C
 
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