This is going to be a challenge! - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 08-14-2019, 03:55 PM   #1 (permalink)
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Default This is going to be a challenge!

Not sure if this was a bright move or not but I picked up this somewhat 'distressed' Seiko 6458 diver yesterday after making the seller a low offer...
As far as I can make out these are 'just a bit rare' and finding parts for it , to say the least, difficult, but for 30 I just had to take the chance..






Finding the correct shape hands to fit could be a problem and I do hope it comes with a back!

Last edited by John_D; 08-15-2019 at 03:34 AM.
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Old 08-14-2019, 06:08 PM   #2 (permalink)
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This is a watch that's definitely on my wish list. I would be stripping the movement and rebuilding it. In my experience these old quartz need to be in really bad shape to be considered unfixable. I wonder how hard it's going to be to find some hands?
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Old 08-14-2019, 06:58 PM   #3 (permalink)
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Originally Posted by IMeasure View Post
This is a watch that's definitely on my wish list. I would be stripping the movement and rebuilding it. In my experience these old quartz need to be in really bad shape to be considered unfixable. I wonder how hard it's going to be to find some hands?
If the coil or circuit is defunct then getting replacements will be very difficult, especially as I can't find a Seiko Technical guide for the 6458 movement.....we are spoilt with the 7548 due to the proliferation of 7546 watches about that can furnish spares....
As for the hands I have found some pictures of 6458's with apparently 7548, 6309 or SKX hands, while other pictures show slimmer hands with a more acutely pointed arrows and almost no step on the sides....
Still that is all a bit academic If I can't get the movement to run .
More when the watch arrives.....

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Old 08-14-2019, 08:11 PM   #4 (permalink)
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I've got 3 original 6458's. A white dial version, orange dial version, and black dial version. I passed up a chance at a Teal dial version awhile back that I'm still regretting but just couldn't bite the bullet at nearly $500.
If you need any photo's to help you along with finding some original parts let me know.
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Old 08-15-2019, 05:31 AM   #5 (permalink)
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I've got 3 original 6458's. A white dial version, orange dial version, and black dial version. I passed up a chance at a Teal dial version awhile back that I'm still regretting but just couldn't bite the bullet at nearly $500.
If you need any photo's to help you along with finding some original parts let me know.
Thanks I'll bear it in mind.
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Old 08-15-2019, 06:38 AM   #6 (permalink)
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I pointed John (Bentley) to one which he got - it was a non runner
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Old 08-15-2019, 06:58 AM   #7 (permalink)
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I have the 6458 6020 mid size version. The hands look like this.
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Old 08-15-2019, 08:39 AM   #8 (permalink)
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I have the 6458 6020 mid size version. The hands look like this.
Yes those are the ones I have seen on the majority of the pictures on the internet, though some have hands that look like the ones fitted to the 7548.

Yours is the interim, 200m rated, 6458 version, only made in 1984, that preceded the release of the 7C43 mid-size quartz replacement, which appears to have been fitted with the 7548 style hands.

This might explain the 6458's with that style hands, having been fitted with the 7C43 ones either by Seiko or others, during repair/refurbishment...
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Old 08-21-2019, 12:28 PM   #9 (permalink)
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I’ve got an orange dialled one I picked up locally- it’s peoba too small for me- I thought one of my girls might like it but apparently not
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Old 08-21-2019, 02:33 PM   #10 (permalink)
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Quote:
Originally Posted by SeikoPsycho2 View Post
I've got 3 original 6458's. A white dial version, orange dial version, and black dial version. I passed up a chance at a Teal dial version awhile back that I'm still regretting but just couldn't bite the bullet at nearly $500.
If you need any photo's to help you along with finding some original parts let me know.
dang, you sure do have a lot of watches! hehe

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Old 08-21-2019, 04:26 PM   #11 (permalink)
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Quote:
Originally Posted by lewie View Post
I pointed John (Bentley) to one which he got - it was a non runner
Still got it Paul the intention is to TST it when I get round to it (when) the internals are pretty poor on it though.

This is one I bought and sold some time ago.
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Old 09-09-2019, 04:59 PM   #12 (permalink)
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Well the story continues...........The watch arrived and

a) the coil was trashed
b) the hand driving part of the movement was rusted solid
c) there was no back with it
d) the crystal has a couple of weld splatter pits

The good news was that the case and bezel (which rotates with clicks like it should) is in good condition with no major marks and the crown screwed in properly and the day and date wheels manually changed in the setting mode. (I ran a full revolution of both day and date wheels, everything changed smoothly and there were no blemishes on either).

The ebay seller (who I had asked about the back before bidding and had replied that he thought it did have one but would check, then never got back to me again), offered to take the watch back, but then I found someone in France selling the correct back,

so declined the offer.
A bit of research showed that like the 7548, which has the 7546 dress watch movement to supply spares, the 6458 has the 6433 dress watch, which has an identical movement, other than it's only got the 3 o'clock crown. Other than that the only other differences are the positive battery connector is slightly different to accommodate the thinner battery in the 6433 and the movement identifier plate which proclaims it is 6433 (this just covers the circuit and is held in place by two screws).
After a bit of searching I tracked down a 'non working', but very clean, 6433 in Athens and made an offer on it ($15) which was accepted....






Well it arrived today and upon inspection I could see that a battery leak had done no favours to the circuit, but the coil was good and the movement appeared to be OK. I stripped the circuit out of the 6458, which looked very clean with no signs of damage, cleaned up the contact faces and fitted it to the 6433 movement (replacing the 6433 cover plate with the 6458 one at the same time).
I changed the +ve connector, put a battery in it and was rewarded with the QT-99 Quartz tester showing a steady pulse.
I now had an electronically working movement. However not a twitch out of the hands.

About an hour of cleaning, lubing and spinning up the movement with the de-mag tool, got it ticking away merrily.

I now 'just' needed to swap out the 3 o'clock day and date wheels, replace them with the ones from the 6458, then fit the 6458 dial and chapter ring.......
I remove the dial and Kanji day wheel from the 6458 movement but the three tiny screws holding the date wheel cover disc where a nightmare . I managed to unscrew two of them finally, but due to corrosion the third one wasn't budging. As the movement was scrap anyway I decide that I could afford to 'carefully' destroy the cover plate to release the date wheel...., no problems day and date wheels removed.......
I then removed the hands and dial from the now running 6433/48 movement, got the day wheel off but could not budge any of the three tiny screw securing the date wheel cover disc. Not willing to risk any damage to this now resurrected movement, for the time being I have just replaced the day wheel and will re-visit this some time in the future, living, for the time being, with the misaligned date wheel.
I fitted the 6458 dial, chapter ring and 6458 dial spacer, wound the watch on till the date just changed over....now time to fit the hands.
I decided that the nearest thing that I could get to the original, missing, hands were a set from a SKX 0030 mid size diver, so had obtained an after market set.
This is where it all went wrong! SKX hands have bigger bloody holes in them than 6458 ones.
For the time being, just for testing purposes, I have fitted the hands from the 6433 watch, so I could monitor if it had any hiccups when initially running... Looks a trifle 'lived in' but it's a work in progress




(all OK, been running for about 6 hours now, showing +00.7 secs/day, will improve on that some time later).


So now my problem is where to obtain a suitable hour and minute hand? I have measured the old 6458 movement and it would appear that the bore of the hour hand is 1.10mm and the minute hand is 0.65mm, can any one confirm this?
The second hand wont be a problem as the SKX 007 one is the same fitting and might just need shortening a little....
So to round up this instalment, can any one on here suggest a source of suitable hands?
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Old 09-09-2019, 05:56 PM   #13 (permalink)
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Remind me your address John and I will drop the complete movement/dial/hands out of mine and send it to you to do with what you like
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Old 09-09-2019, 05:57 PM   #14 (permalink)
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Remind me your address John and I will drop the complete movement/dial/hands out of mine and send it to you to do with what you like
Many thanks John, that would be fantastic Will PM you the details.....
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Old 09-09-2019, 06:07 PM   #15 (permalink)
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Cool project. Be sure to keep us posted.

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