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Post by yorkiesknob on Feb 13, 2020 0:45:24 GMT -8
Hi all, Just opened up the back of 3 of my 6139s which require work. All have A movement stamped on them . However one is different. 2 have a short spring on the flyback lever whilst the 3rd one has the spring like on the B movement which ends on the top of the lever around the half head stud. So I took the auto winding off the odd one then I compared the chrono bridge with one from a B movement and its slightly different.
So I was wondering if there was a small window of transition A to B and some parts were used on both . Or at sometime somebody has interchanged parts from one to the other.interchanged parts from one to the other. Hope te explanation is clear enough as I not an expert of all the watch part terms. As always thanks for looking Tony.
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Post by SeikoPsycho on Feb 13, 2020 2:32:29 GMT -8
I doubt there was any transition period that involved the mixing of parts between an "A" + "B" movement other then the parts that normally interchange between the two. "A" movements use the short spring on the pusher return and "B" movements use the long spring. Because of this the barrel + train wheel bridges are different.
"A" chrono bridges have the intermediate recording wheel attached to the bridge while on the "B" movements the wheel is independent of the bridge.
It sounds like your odd movement is a mismatch of parts.
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HiBeat
Global Moderator
SEIKO Iko Iko GDTRWS
Posts: 8,667 
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Post by HiBeat on Feb 13, 2020 7:36:13 GMT -8
Thanks Tom. That's what I would have strongly suspected too. Nice to hear confirmation from our resident authority.
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Post by yorkiesknob on Feb 13, 2020 14:30:39 GMT -8
I doubt there was any transition period that involved the mixing of parts between an "A" + "B" movement other then the parts that normally interchange between the two. "A" movements use the short spring on the pusher return and "B" movements use the long spring. Because of this the barrel + train wheel bridges are different.
"A" chrono bridges have the intermediate recording wheel attached to the bridge while on the "B" movements the wheel is independent of the bridge.
It sounds like your odd movement is a mismatch of parts.
Thanks for the reply and comments. Its kinda what I suspected. Will pull it down to today and see how it looks. I have another B already stripped down so it will be easy to compare as I go. Cheers T
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