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Discussion Starter #1
I have a Hamilton Khaki SWAT that I bought a few years ago. The battery is low and is indicated by the second hand doing 4-second skips. It's the same indication used by my Omega SMP Quartz. When I opened up the Hamilton, looks like it has the same movement as the Omega. Very interesting. BTW, I haven't reset the time on the Omega since 2004, and it lost 1 minute in 6 yrs, or 10 secs/yr. The Hamilton loses 2 secs/month, or 24 secs/year.
 

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Hamilton has a 7 jeweled movement and the Omega has 6. Looks like there is some identification near the battery but I can't read the Hamilton and the Omega is covered by the gasket.

That's incredible performance for both, but the Omega in particular. Also impressive that the Hamilton is using a jeweled movement for that model.
 

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I have recently the Pre-Bond seamaster quartz with the 1438 caliber, which preceded your 1548 around 1992? Amazing results from both brands!!!! I wonder if my Seiko quartz 7548 has comparabel accuracy specs? I read that the 1438s ran about +-15secs/month...but your readings are amazing! thanks for posting!
Your 10sec/year is nearing HEQ specs! wonderful!
 

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Another thing...I bought the Omega in Feb 2004. The sticker on the back says "0608 battery change". I think that means the battery is due to be changed in June 2008. I don't wear that watch much and mainly just keep it in the box. I check it a few times a year to make sure the battery hasn't run out yet. It's just now doing the low-battery indication. That's over 6 yrs on one battery. Pretty good.
 

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Its amazing you are getting that accuracy by not wearing the watch much as in the absence of a formal thermoregulation system, your wrist is the best alternative.

Do you now if this is a high frequency quartz?
 

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Time2Fly said:
I don't know if it's a high freq quartz. When I open the case, I'll take some good photos of the 1538 movement. The one I posted earlier was collected from the Internet a few years ago. I just found another photo of the 1538 movement which looks slightly different.
apparently only the Omega caliber 1441 is considered HEQ thermocompensated. The 1438 came next in the SMP series followed by the 1548 in the Bond model, likely in 1991/2.
 

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Discussion Starter #11
Finally had time to open up my Omega SMP Quartz to change the battery. I was worried that my el cheapo Harbor Freight case opener wouldn't work on the 5-point Omega case back, but it worked just fine.

Attached are some photos of the Omega and Hamilton Khaki Quartz for comparison.
 

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