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Discussion Starter #1
I have sent this watch to an acquaintance who wanted an older style Seiko diver. He liked the concept of automatic over quartz.
I got him a nice looking 7002 and put an original jubilee strap and black bezel insert.

I tested the watch and it kept pretty good time within a 2 minutes per day.
I got the watch back off him today- He told me it was 10 min out per day and only lasted 9 hours.

Ive tested the watch and it seems to have kept time quite well over the last 3 hours.

Im thinking- regardless of how good I get this auto, he will be comparing it to a quartz...

Sorry for the lengthy lead in story, I am looking at the options of a quartz mod.
I have a few Seiko Quartz in the parts bucket, including a 7546 that is in poor condition externally and a 7546-6040 that is waiting a bezel, along with a few other pulsar, seiko and lorus quartz movements.
Question 1.
Is it only the 7546's that share the hands with the automatics?
Question 2.
Do the quartz dials have there feet in a different position to automatics?, I vaguely remember this being the case. And is this true for all quartz including the 7546.
Ive attached a pic of the watch before it got the jubilee bracelet.
Your advice will be appreciated.
 

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My understanding of this is:
6309, 7002, 7546/8 hands all interchange and possibly other Seiko types too.
Dial feet positions of 7002 dials don't match across the movements mentioned.
I am not aware of quartz movements that transfer into the 7002 diver cases as they do between 754x and 6309.
There are other 700x calibre auto's that have been made to go in but I haven't heard of (but would like to) quartz being used.
I have a number of standard 7002-7xxx's but have only swapped a dial so far by removing feet and using dabs of glue and nothing more adventurous.
 

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It sounds suspiciously like he's not wearing it enough to wind it. I don't think that the quartz swap is a sensible proposition, hands, date dial diameter, movement rings, chapter ring, crown/stem mating and stem height are some of the issues involved.
Maybe just sell the 7002 and buy a quartz?
 

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Im no expert, one should be along shortly.
based on the research and experimentation i have done, if the 7546 will fit into a 6309 it will fit into a 7002. However you will have problems with the crown and stem and possibly with date alignment.
I have toyed with fitting a 6309 into a 7002, using a dress watch stem with a stem extender and a threaded AM 7002 stem and crown, but in the end i figured its easier to go buy a 6309.

The 7009 movement is a day date version of the 7002 date only movement. and will fit directly into the 7002 divers case. You will have to use the 7002 date wheel to get the date to align in the window. 7002 stem and crown plugs straight into the 7009 movement. Theres loads of cheap 7009's on the interweb.
You can probably also use the 7006 and 7005 movements although they are very slightly thinner by 0.25mm i think. and there are differences in the length of the 4th wheel pinion, (depending on model).which could affect fitting of the ss hand

Not sure about the 7546, but 7548, and pretty much all auto diver hands will interchange.

I have much the same problem, i gave a friend a good working 7002 7001, it's come back twice with problems, though i cant find anything wrong with it and it works fine while its in my possession. I think half the problem is, people don't know how to use an auto.

Nice looking 7002 by the way.
 

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Discussion Starter #5
I have much the same problem, i gave a friend a good working 7002 7001, it's come back twice with problems, though i cant find anything wrong with it and it works fine while its in my possession. I think half the problem is, people don't know how to use an auto.

Nice looking 7002 by the way.

Spot on about people's expectation of autos.

I always think about a post I read once. It described the error rate of automatic and mechanical watches based on percentage of beats per hr.

After my simple calculations based on a 21600 bph of the 7002, that's 518000 and 3600beats per min.
3600/518000 x 100 = approx 0.7% error rate for 1 minute per day.
 

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Discussion Starter #7 (Edited)
So close. I experimented with a 7546-6040 movement. It fitted secured and the crown position was perfect. Only issue- stem and crown.
The original for the movement stem was too short. The 7002 movement was date only and couldn't engage and the 6309-7040 crown was too large.
I don't know stem modding yet. Guess that's the next option.
 

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Discussion Starter #8
And now for the 7009 movement in a 7002-7000 case.
I feel everyone's pain when they stumbled across this misalignment by 1-2 minutes!
 

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And now for the 7009 movement in a 7002-7000 case.
I feel everyone's pain when they stumbled across this misalignment by 1-2 minutes!
You will need to swop out the date wheel for the 7002 one, and use a date only dial.You may have to cut the dial feet off and use glue or dial dots if your not going to use a 7002 specific dial.

Heres one of my 7002's running a 7009 movement and an SKX hand set fitted. 70029.jpg
 

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You don't think I should pursue the quartz option?

You could fit something like a Seiko 7N43 Quartz day/date movement in it and with the 7002 dial only the date will be showing. You'll have to make sure (or use an extension) that the stem & crown thread are the same and that the date lines up too.
 

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You don't think I should pursue the quartz option?
Your 2/3 the way there, but you will have to mod the stem.
The 6309 stem fits the 7546 movement, so i would look into using a stem from a 6309 dress watch and unscrew the crown
The original 7002 stem is a one piece affair, however there are aftermarket ones which are threaded and the crown screws on.
So possibly, 6309 dress watch stem then fit a stem extender/adapter, then cut down and fit the aftermarket 7002 threaded stem and crown.

I think ive seen stem extenders and adapters on the cousins website.
 

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Discussion Starter #13
Thanks. I did as you suggested with a 7009 movement I had laying around. When I looked closer at the 7002 movement it had a rotor that was signed seiko Singapore and it just didn't look as good as the 7009 movement. I'm wondering if the 7002 movement I had was one of those phillipines Frankenstein movements.
I've run into a couple of problems.
1. The foot broke of the 7002 dial.
2. The date still doesn't seem to line up. I used the 7002 date wheel on the 7009 movement.

I'm starting to think quartz might be my better friend.

When I originally attempted this I thought I would be similar to a 6309 mod that I have read of.
No wonder everyone likes that case and movement.

The 7s26 stem wouldn't suit a 7546 quartz would it?
 
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