The 7548-7000 was Seikos first attempt at a quartz powered dive watch and was adapted from the 6309 platform. As such it’s a tremendously over engineered movement and consequently one of my favourite quartz movements. The 7548-7000 was destined for the Japanese domestic market and sports an English/Kanji day wheel. Supergroup Queens lead guitarist Brian May has famously worn a similar 7548-7010 for many years, a very similar model apart from a screw down crystal retaining ring instead of a press fit one.
The watch featured is in remarkable condition and came in for a service and battery change as the owner plans to keep it long term.
It’s still sporting it’s original GL831 rubber strap which is good to see. You can still make out some of the original blue caseback sticker in between the wave on the tsunami logo!
A look inside shows it’s very clean and the all important battery strap is still in place.
The dial and hands are in tip top order on this one, in this shot they are lined up ready for removal.
The watch was fully stripped down, it may be a quartz movement but what a robust one it is.
Re-assembly began with the centre wheel…..
….then the bridge and motion work….
….then the top plate and hacking lever.
The circuit block, coil and battery were then replaced and it ticked once more.
The calendar side bears a striking resemblance to the 6309 from which the movement was developed.
The keyless work re-installed.
Ready for the day-wheel, it could almost be a 6309 from this view!
Dial and handset refitted.
The movement recased.
The pressure test is next.
Another one done and what a beautifully original example it is.
The Watch Bloke 
My understanding is that he wore a 7548-7010 JDM which is a bit different than the 7548-7000.
http://www.thewatchsite.com/21-japanese-watch-discussion-forum/16944-watch-fit-rock-star.html
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Quite probably, I knew it was a 7548 of some description. Nice to know he’s worn a Seiko for all these years when he could afford any watch he wants!
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Duncan… so great to see this watch again (previously owned by me and stupidly let go). It still looms fresh and sharp… and that strap is the most comfortable I ever had. Good news for me… It is coming back into the mrwozza70 fold very soon. I now know it will be running sweet for a goid while. Keep up the brilliant work.
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Not 20 minutes ago, I found my beloved 7548-7000 exactly where I put it (and forgot) 32 years ago, in a pocket of the backpack I wore while trekking in Nepal. I remember now that I caught the (metal) band on a rock, and it broke, causing me to stow the watch and spend the rest of the trip watchless.
In the intervening years I have bought many nice watches. It will be interesting to see how much I wear the Seiko now that I have it back.
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I do hope that you got it working again? Hopefully the battery did not spring a leak inside it. They are quite a watch!
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Are you able to service my 7548-701l
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Email me on thewatchbloke@gmail.com and I’ll get back to you.
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HI,my name is Paolo,and i’m a proud owner of a seiko 7548/7000 051413.regretfuly during the change of the battery in a watch shop was given back me with the upper part of the stem broken.the lower part is healthy and once the case is opened i can post hours and date(italian-english).The inside of the crown apparently is empty,but stil it can be tightly screwed on the case.I was looking here and there on the web but time being i’m really lost being unable to understand which spare parts i should buy(crown,or stem or both ).Furthemore the crown and stem of a seiko 6309 would fit ?.By the way the watch is very precize and running very well.
Could you please help?i have several other watches but i’m extremily fond of this one which is mine from almost 40 years.Thanks so much in advance.Have a nice evening
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It sounds like you need a crown and a male stem section as I would imagine the male section has snapped off inside the crown.
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Hi I own a 1979 vintage 7548-7000 Seiko watch 150m. Is this a Diver or does it have to say Diver on the dial to be one? Next, can I scuba dive with this watch and hiw deep can I go with it?
Dan
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Yes it’s an ISO rated dive watch and you could dive to 150m with it when it was new. However attempting to dive in a very collectable vintage watch is in my opinion very foolish even if it’s passed a pressure test, if anything went wrong you could end up trashing the watch. This would be bad enough with a current model where parts are readily available but absolute lunacy with a vintage piece! Buy a cheap modern dive watch to dive with and save the vintage pieces from any risk.
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Owned one of these beauties with a Seiko factory bracelet with dive extension and solid center links like a Militat super jubilee. Sold it when I went through my quartz hating period around 1990. One of those tragic mistakes you look back on with huge disappointment in yourself LOL.
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