7548/6309 stem tube size question - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
Reply
 
LinkBack Thread Tools
Old 03-14-2016, 11:01 PM   #1 (permalink)
Special Member
 
Join Date: Jun 2015
Posts: 1,123
Points: 63 (+)
Default 7548/6309 stem tube size question

Hi all!
I've got a 7548 case with what looks to be an "out of round" stem tube. What I'm wondering is whether the tube is the same size as the tube on a 6309.
I don't have a 7548 crown to try on it, but I tried a crown from a 6309 and it won't fit. Won't get past the end of the tube to the threads.
From the look of both stem tubes, they appear to be close to the same. The tube on the 7548 looks a bit "ballooned" on its end. Somewhat misshapen.
I'm thinking the tube on the 7548 may be bad.
Any thoughts on shrinking down the tube size? Maybe heating it with a torch and then quenching in ice water? Might be worth a try.
Comments and advice appreciated.
Mike
Aquaman is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 03-14-2016, 11:09 PM   #2 (permalink)
Senior Member
 
DAHASCO's Avatar
 
Join Date: Apr 2010
Posts: 23,083
Points: 250 (+)
Default

Mike, The 7548 and 6309 crown fit the same, If the tube is out of round you can use a Bamboo skewer to reshape it. Just widdle it down to fit.
DAHASCO is offline   Reply With Quote Quick reply to this message
Old 03-15-2016, 03:21 AM   #3 (permalink)
28A
Senior Member
 
28A's Avatar
 
Join Date: Jul 2015
Location: Brisbane, Australia
Posts: 779
Points: 33 (+)
Default

As above the crowns are the same.

Infact, the case is dimensionally the same internally which is why you can swap a 7548 and 6309 movement back and forwards.

I bet you could find someone on here that has a mint 7548 case (or even a 6309-7290) you could buy off them for bugger all. Why bother fixing it if you can buy another bare case that's perfect for hardly anything.
__________________
Nick.

Vintage Seiko | Vintage Divers
28A is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 03-15-2016, 04:54 AM   #4 (permalink)
Special Member
 
Join Date: Jun 2015
Posts: 1,123
Points: 63 (+)
Default

Thanks guys, for helping me out here. It looks like the tube is expanded right on the end.
Not sure how something like that happens. In any event, I could probably find a 6309-7290 case pretty easily. Just bought a nos 7548 case on Ebay tonight but that one is perfect {watchmakers liquidation}. That one also came with two additional case backs {not sure what they fit}, a nos 7548-700f dial and a vintage pulsar complete diver.
I guess I'll still be looking for a 6309-7290 donor case though. I can use the case back from the one I have with the bad stem tube to get that one back in shape.
Thanks again for all your help!
Mike
Aquaman is offline   Reply With Quote Quick reply to this message
Old 03-15-2016, 05:06 AM   #5 (permalink)
Senior Member
 
Join Date: Jun 2012
Location: SE UK
Posts: 2,590
Points: 55 (+)
Default

Mike for a project you could possibly trim down the steam a little - it should still function ok(I think)
lewie is offline   Reply With Quote Quick reply to this message
Old 03-15-2016, 05:28 AM   #6 (permalink)
Special Member
 
Join Date: Jun 2015
Posts: 1,123
Points: 63 (+)
Default

I was actually considering doing that. Might not affect anything at all. Not much needs to come off.
This is the one I was going to tst instead of the 7c43. I could just let John have a look at it. If that would work, then he would already have it there to do all the machining.
I think it may have gotten expanded from years of over tightening the crown. Sort of "mushroomed" the stem tube.
Mike
Aquaman is offline   Reply With Quote Quick reply to this message
Old 03-15-2016, 05:49 AM   #7 (permalink)
28A
Senior Member
 
28A's Avatar
 
Join Date: Jul 2015
Location: Brisbane, Australia
Posts: 779
Points: 33 (+)
Default

Just find another case.. put a wtb ad up i'm sure someone will have one lying around.

Why pay John to machine out and do another tube when you could probably find another case for like $20?
__________________
Nick.

Vintage Seiko | Vintage Divers
28A is offline   Reply With Quote Quick reply to this message
Old 03-15-2016, 05:56 AM   #8 (permalink)
Senior Member
 
Join Date: Jun 2012
Location: SE UK
Posts: 2,590
Points: 55 (+)
Default

I think you'd be luck to find one for $20 well you would here in the UK
I'd be happy to pay $20 for one
lewie is offline   Reply With Quote Quick reply to this message
Old 03-15-2016, 08:23 AM   #9 (permalink)
28A
Senior Member
 
28A's Avatar
 
Join Date: Jul 2015
Location: Brisbane, Australia
Posts: 779
Points: 33 (+)
Default

I saw one on here a few weeks ago for about $20 - $25 bucks. Even if it was $25 US still worth buying if you have a buggered case..
__________________
Nick.

Vintage Seiko | Vintage Divers
28A is offline   Reply With Quote Quick reply to this message
Old 03-15-2016, 08:24 AM   #10 (permalink)
28A
Senior Member
 
28A's Avatar
 
Join Date: Jul 2015
Location: Brisbane, Australia
Posts: 779
Points: 33 (+)
Default

Actually i could probably get my hands on one but it'd be a while.. i traded my watchmaker a 6309-7290 case for my 7040 case now that i think about it. I dunno what he'd want for it though..
__________________
Nick.

Vintage Seiko | Vintage Divers
28A is offline   Reply With Quote Quick reply to this message
Old 03-16-2016, 02:28 AM   #11 (permalink)
Special Member
 
Join Date: Jun 2015
Posts: 1,123
Points: 63 (+)
Default

Ok. All well taken.
I've got three bare 6309-7040 cases with no movements so maybe the thing to do here would be to spend a hundred bucks on a complete 6309-7290. I could use the case for the tst project and use the movement, crown, stem for one of my 6309-7040 restorations.
Will keep you all posted.
Thanks,
Mike
Aquaman is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
6309 stem tube dimensions R50us68 THE JAPANESE WATCH DISCUSSION FORUM 3 03-07-2015 10:53 AM
KS Special 5256 stem tube question eye_lip Watchmaking & Tinkering - Reference Materials & How-To's 2 05-05-2014 05:44 PM
6309-7049 Stem Tube Question reinking71 THE JAPANESE WATCH DISCUSSION FORUM 7 08-28-2012 09:02 PM
Case tube thread size question andy12r THE JAPANESE WATCH DISCUSSION FORUM 0 08-16-2012 07:14 AM
7548/6309 stem question northdock THE JAPANESE WATCH DISCUSSION FORUM 3 11-18-2010 11:19 PM


All times are GMT -4. The time now is 12:35 AM.



Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.