Some 6139 Questions..

[earthphase]

Hi guys. I searched but came up empty.

1) what is the difference between 6002 and 6005?

2) what is the difference between 6139A and 6139B?

3) And technically, Col. Pogue wore a 6139-6005 Gold? A or B?

[69ChevelleSS]

Dec 14, 2014 10:05:13 GMT -8 earthphase said:

Hi guys. I searched but came up empty.

1) what is the difference between 6002 and 6005? - I believe this just designates the geographic location the watches were being distributed to.

2) what is the difference between 6139A and 6139B? - Movement variation I believe.  No knowledge about the technical differences though.  Some here will know exactly.

3) And technically, Col. Pogue wore a 6139-6005 Gold? A or B?

[feca67]

6139A vs 6139B a good question.  The short answer is the B version replaced the A version. There are many differences between these two movements, yet they are direct equivalents.  They have more or less the same number of parts, and each part fulfills the same function and they all fit together in basically the same way.  It's a case of a slightly longer lever here, a slightly shorter spring there.  Many of the main components are incompatible and can't be swopped between the two movements.  The question is, after just a couple of years in production, why did Seiko give the whole movement a full design revision? It was a ground breaking movement, and maybe it was rushed to market, I guess they identified several minor issues they thought were worth fixing, but exactly what all those issues are I'm not sure.  Don't be put off though, a 6139A in good running condition is very reliable and accurate.

[siralan]

I found out the hard interesting way what the differences between the 6139A and 6139B movement are.

The following parts are different:

• Transmission wheel (*)
  
• Centre chronograph wheel
• Chronograph bridge
• First coupling lever (*)
• Second coupling lever (*)
• Barrel and train wheel bridge
• Operating lever spring (*)
• Minute recording jumper
• Intermediate minute recording wheel

The ones marked (*) are where I tried to use the 6139A part in a 6139B or vice versa, and failed !!

There are other different parts, but this is a good start.

[earthphase]

That leads me to another question. In my quest for a Pogue I never really cared about if the movement is any good. Is it? I know it's history and significance, but can it still be a movement worn and used nearly everyday, or is it more or less not really a good choice to wear regularly?

[69ChevelleSS]

Dec 14, 2014 17:27:17 GMT -8 earthphase said:

That leads me to another question. In my quest for a Pogue I never really cared about if the movement is any good. Is it? I know it's history and significance, but can it still be a movement worn and used nearly everyday, or is it more or less not really a good choice to wear regularly?

Put it this way . . . .

My Mom bought this one for my Dad back in '72.  He wore it daily for years then gave it to me.  I wore it daily for years until the crown broke.  It went into a drawer for many years until I met Shawn C. on anther forum and he offered me a genuine Seiko crown.  He installed it and suggested that I get the movement serviced.  I sent it to Spencer and now the thing runs dead on accurate.

[Deleted]

These movements are amazing quality and value when you compare them to other brands at 3 or more times the price such as Rolex or Omega. There are a few parts that are different but on the whole the movements are the same. Personally I cannot tell the difference on my wrist apart from the B movement always seems to reset a bit quicker and sharper although that could just be my mind playing tricks on me.

This is a Timegraph result after servicing a 1970 resist watch of mine.



I can tweak it and get those results even better but I always leave it to settle a few days before considering the watch finished.

That's saying accurate to -1 second per day with a perfect beat error of 0.0 and good power at 216AMP which has since gone up to 265AMP on this particular watch.

Not bad for a 44 year old watch

If you want to see all the differences between the two movements then check out the parts lists here:

drive.google.com/folderview?id=0B-k1fpJj0LTUMXdDeHlleFlrekk&usp=drive_web&tid=0B-k1fpJj0LTUNE5DWHZqWE4yT00

The main mods were made by Seiko from what I have been told to improve the reset action of the chronograph, the larger clutch was fitted to the center chronograph wheel to make this stronger and last longer and a couple of small differences between the chronograph bridges.

In the real world other than the reset being a bit quicker and smoother on the B movement you cannot tell any differences.

[SALVO]

Hello everybody, I was working on a 6139A 17J yesterday and noted a couple differences on the mainplate. I havent done much work on the a version of the 6139 so yesterday had the chance to look and compare the mainplates properly.

I thought it could be a useful way to determine if maybe a watch we are interested in is a franken or an orginal. You can tell if the trainwheel brdge is an a or b from the fly back lever, it could be a A mainplate on a B bridge or viceversa, although it would be quite hard to make it work mixing an A mainplate and a B bridge(or the other way around) I dont know to what extend the people that build frankens could go. So,

Here picture of a 6139 A 17J



Now 6139B


Here ive highlighted the diferences





Its not the easisest thing to see but I wanted to check if its possible to see that when the movement is in the watch and fully build up.
Yes it is possbible, just need to press the chrono reset pusher and you can see the mainplates.




Hope this helps and please if theres something to add or a mistake let me know so, would be much appreciated.
have a good day everybody
Regards
Salvo