Loosing Time - Original Seiko 7548-700F Diver - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 05-18-2018, 06:45 PM   #1 (permalink)
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Default Loosing Time - Original Seiko 7548-700F Diver

I bought my 7548-700F Seiko diver new in the 1980's. Never a problem other then changing batteries and o-ring seals. With a fresh battery the watch now looses time (the second hand hesitates about every third pulse).
A few options: Pay to have the watch serviced, sell it as is, or learn how to service it myself. So far I have not found info about self-maintenance.
I did free up the crown detent using the excellent info on this site.
Is self-service an option?
What is the price range for servicing? Does it make sense to service the watch if I decide to sell it?
Comments welcomed.
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Old 05-18-2018, 06:53 PM   #2 (permalink)
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Welcome aboard!

It depends, really. You need a lot of tools to service a watch movement properly. It's not something I would suggest you do as a first trial...

Service costs vary depending on who you go to. It might be worth it to just send it off but if you aren't too bothered about keeping it due to the expense etc then sell it for something better or different?

Service costs can be anything from 50 quid to 350.
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Old 05-18-2018, 07:05 PM   #3 (permalink)
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The problem started with a new battery? Try another new battery if you have not yet tried it. The new battery might be defective. I have 2 Quartz Chronos that stuttered with a new battery, went and got a new fresh Duracell and they ran fine. A Quartz will stutter with a weak or faulty battery, just learned that a few weeks ago. Thanks to Guy J^.
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Old 05-18-2018, 07:08 PM   #4 (permalink)
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Likely old oil, but yes a dodgy battery can cause a movement to play up or go into power saving mode where it ticks every two or 5 seconds. If the hand is hesitating every third pulse I'd say that it is likely a bit of dirt or debris that got in there when the caseback was last opened. It doesn't take much at all to stop these movements.
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Old 05-18-2018, 11:35 PM   #5 (permalink)
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Default Working again


Thanks to all who responded. I carefully blew out the movement with some compressed air and tried another new battery. It seems to be working fine with no hesitation.
So far so good.
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Old 05-19-2018, 12:12 AM   #6 (permalink)
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That's great, glad to hear you got it sorted out.
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Old 06-05-2018, 02:59 PM   #7 (permalink)
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Default Not So Fast

It turns out the watch has a damaged driving wheel that's causing the hesitation at date change. It is part # 802 601. I'm looking for a replacement. I think parts from a 6309A movement are the same. Help is appreciated
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