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Omega Seamaster Apnea 2595.50 Caliber 3601, low power reserve and inconsistent accuracy, does it need service?

D
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Dear forum members,

I own a Seamaster Apnea (2595.50.00) with the caliber 3601 which has an ETA 2892-A2 base with a Dubois Depraz 2029 Chronograph module (to the best of my knowledge and the limited info available).
Lately the watch started to lose 1 minute per day while having a power reserve of 2-6 hours (from being manually fully wound). When the watch has stoped, I though to activate the chronograph. Turns out that the when the chronograph runs, the watch is accurate from -5 to 0 seconds per day (as it used to be) and the power reserve is more than 44 hours (Omega advertised 44).
Any ideas why this happens (especially from @Archer )?

Many thanks 馃榾

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Scarecrow Boat
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D D_M
Lately the watch started to lose 1 minute per day while having a power reserve of 2-6 hours
D D_M
Any ideas why this happens
Sounds like it鈥檚 time for a service.
 
dsio
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The watch is probably 20-25 years old now so if it hasn鈥檛 had a service lately it鈥檚 probably very overdue at this stage. Being a piggyback movement you鈥檙e probably looking at going with an Omega service through a boutique or something as parts for the chronograph module are not made available even to Omega certified watchmakers.
 
D
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Thank you for your responses. It is definitely time for a service!
I only service my Omega watches through boutiques or directly with the national service center if allowed.
Do you know if the movements with a Dubois Depraz chrono module are disassembled or they just replace the module?
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Dan S
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Possibly a mainspring problem, but if it's due for a service anyway ...
 
Dsloan
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Hello fellow Apnea owner! I could be wrong, but I think they would disassemble and service the module?

NM: Google tells me that a replacement of the module is often the course of action, FWIW.

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padders
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In my experience the chrono modules are routinely replaced on the Reduced, Dynamic III chronograph and similar like this but this may be a special case. The GMT layer in the Great White etc for instance is AFAIK repaired rather than replaced. Replacement isn't IMO a bad thing here.
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Archer
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Often the entire movement is swapped, but I鈥檓 not sure if this would be the case with this model. But anyway Omega is the best place for these.
 
J!m
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These are a very cool and unusual reference. The bright red is sharp!

But I'll echo everyone ese: this needs clean lube and adjust with a new mainspring (at a bare minimum).

Re the "great white": I had one years ago and always thought it was a regular GMT movement in there, and not a piggy-back module...
 
padders
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J!m J!m
These are a very cool and unusual reference. The bright red is sharp!

But I'll echo everyone ese: this needs clean lube and adjust with a new mainspring (at a bare minimum).

Re the "great white": I had one years ago and always thought it was a regular GMT movement in there, and not a piggy-back module...
Nope. The GMT has a 2892 with a module or layer or whatever. ETA make a native GMT movement but it works the other way so to speak. It鈥檚 why the Great White is fatter than the regular SMP
 
Archer
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padders padders
Nope. The GMT has a 2892 with a module or layer or whatever. ETA make a native GMT movement but it works the other way so to speak. It鈥檚 why the Great White is fatter than the regular SMP
Not sure I would consider that a module in the sense of the Speedmaster reduced or the Apnea models.

In those, there is one point from the base movement that powers the entire module, and that includes all hands on the watch, not just the chronograph hands. On the GMT, the extra layer is just there for the GMT, and not for the other hands.
 
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