Better Understanding Seamaster Quartz (Calibre 1425)

I'm a bit of a lurker, so posting for the first time today. My speed (price range) right now is more Seiko (I've done a little tinkering and modding on my SRPD diver) but I'm starting to become drawn to vintage Omega. I have (and will again soon), be traveling to South China / Hong Kong on buisness, so if anyone has experience of buying there, that would be a bonus...but I think in reality I would be buying closer to home.

I have longer term plans to look at mechanical, but today I wanted to ask a couple of general questions about Seamater Quartz models that I see coming up often on ebay etc. Usually these are listed as 1425 calibre, and it seems to be very rare that you get an open back to see a reference number.

They seem to come in all manner of dial colour / texture combinations, so the possibility I think of a redial is high.

What is confusing me is that the 1425 (I think) should be a day date, but loads of these have date only dials while some have day date. What is going on here? Am I missing something about the movement, or is it common to cover the day display with a date only dial? Examples below of typical listings showing date only and day date.



I like the simplicity, size finishing, and thickness of this case style (more so on the date only examples). Given I can't find a reference number:

- Does anyone know the reference for this style?
- Is there an equivalent or similar automatic reference I can look at?

I found a couple now with the caseback open and visible movement, can see both marked as 1425 but both date only. Common practice to redial these date only maybe?

https://watchead.com/product/om-sm-qu-1425/

https://e-v-w.com/products/vintage-omega-seamaster-quartz-cal-1425-vintage-1982

The 1425 is an ETA 955.122 movement. The number 955122 should be stamped near the battery compartment. You could have a day disk, or the day disk is removed under the dial. The ETA 955.112 is date only but shares the most of the parts and circuit board with 955.122.

That is good information, thank you very much. Since ETA 955.112 / 122 appear to still be readily available (and at low cost), does that mean that servicing is not such a concern (for now) with these watches? I've seen it noted elsewhere that availability of parts for older Omega quartz is a problem, but if these ETAs are partially interchangeable then maybe it's not such a big deal?

Right. The Omega 14xx are mostly ETA movement, and parts availability varies depending on particular movement. Omega 13xx series are Omega in-house movements and new parts are not easily available anymore (but used parts are still seen on Ebay from scavenged movements).