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First Gen Aqua Terra Legit check and wrong beat rate?

TerryQTX
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Hello everyone, I just bought my first Omega recently, the first gen Aqua Terra 36mm (2504.30). However, according to two timegrapher apps on my phone, the watch beats at 4Hz instead of the Co-axial typical 3,5Hz. Is it possible that the wake is not genuine? Or are those kind of apps maybe not capable of distinguishing the beat rate differences? I will include some images. Thanks in advance!

Omega 1.webp Omega 2.webp Timegrapher 1.webp TImegrapher 2.webp
 
Dan S
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https://omegaforums.net/threads/is-the-coax-25-200-movement-more-difficult-to-fake-than-the-rolex-28-800.128761/ wristvoyeur
Thread 'Is the Coax 25,200 movement more difficult to fake than the Rolex 28,800?' ·
Does the Coax buyer have a guarantee of authenticity that the Rolex buyer does not in that the Coax 25200 vph is proprietary?
wristvoyeur ·
https://omegaforums.net/threads/2500-movement-different-variations-regarding-bpm.14927/ Fusion
Thread '2500 Movement - different variations regarding BPM?' ·
I am interested an a 2503.33.00, and saw somewhere that the Omega 2500 movement has had 3 revisions. Which revision(s) are in the 2503.33.00 watch and are there significant differences between...
Fusion ·
etc.
 
TerryQTX
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Dan S Dan S
https://omegaforums.net/threads/is-the-coax-25-200-movement-more-difficult-to-fake-than-the-rolex-28-800.128761/ wristvoyeur
Thread 'Is the Coax 25,200 movement more difficult to fake than the Rolex 28,800?' ·
Does the Coax buyer have a guarantee of authenticity that the Rolex buyer does not in that the Coax 25200 vph is proprietary?
wristvoyeur ·
https://omegaforums.net/threads/2500-movement-different-variations-regarding-bpm.14927/ Fusion
Thread '2500 Movement - different variations regarding BPM?' ·
I am interested an a 2503.33.00, and saw somewhere that the Omega 2500 movement has had 3 revisions. Which revision(s) are in the 2503.33.00 watch and are there significant differences between...
Fusion ·
etc.
Thanks! I see then. So given it is an older model of the 2500, it probably is genuine and is just one of the models that still used the 28800 bph?
 
ErichPryde
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Given that it is an older 2500, your beat rate could be correct. Watch accuracy meter absolutely can measure the beat rate accurately.
Here's my SM300:
1000018904.webp


and a 1863 speedy:
1000018902.webp
 
padders
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@TerryQTX If the beat rate is indeed 28800 then it must be an earlier 2500 such as the B spec since from C onwards it used the 25,200 rate mentioned above. How old is the watch? I’d guess circa 2002-6 if it’s using a B spec movement. The 6 digit PIC also suggests pre 2007 manufacture as they went over to the 14 digit form soon after. Does it have dated cards?
Edited:
 
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