UG Cal 138SS And 139 - Any Difference?

hejsam · Sep 6, 2022

Can anyone shed some light on the difference between the cal 138ss and the 139?
And are parts interchangeable between the movements?

(pictures stolen from the web)

My reason to the question more than just the curiosity of learning is that I'm searching for a missing part to my 138ss movement and with the cal 139 (and maybe even the cal 138 and 138C?) it will broaden my search area.

bgrisso · Sep 6, 2022

I don't know offhand, but I usually start research here, which doesn't seem especially helpful in this case:

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&Universal_138SS

Mazoue · Sep 7, 2022

This will be useful to you I think as it shows the parts across the Cal 138 variations.

https://watchguy.co.uk/tmp/Universal 138.pdf

Mark020 · Sep 7, 2022

If Mr Ranfft says this I know enough 😁

Mazoue · Sep 7, 2022

Mazoue
This will be useful to you I think as it shows the parts across the Cal 138 variations.

https://watchguy.co.uk/tmp/Universal 138.pdf

I recall you were looking for part 1494/1 and this document indicates that part is actually different for the Cal 138ss and the other Cal 138 variations. In the absence of any other information, I would not assume that the Cal 139 part is identical.

hejsam · Sep 7, 2022

bgrisso
I don't know offhand, but I usually start research here, which doesn't seem especially helpful in this case:

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&Universal_138SS

Mark020
If Mr Ranfft says this I know enough 😁

I checked ranfft as its obviously the go to place for movement information but somehow missed this statement 😁
"differences not known between 138SS, 139"

hejsam · Sep 7, 2022

Mazoue
I recall you were looking for part 1494/1 and this document indicates that part is actually different for the Cal 138ss and the other Cal 138 variations. In the absence of any other information, I would not assume that the Cal 139 part is identical.

That is correct, I recall looking at that sheet before but never notice the difference between them:

But as they are stated as separate parts even though they have the same name you might be right that they are not interchangeable, damnit just as I felt some luck the search starting to look darker again.

UG Cal 138SS And 139 - Any Difference?

hejsam

bgrisso

Mazoue

Mark020

Mazoue

hejsam

hejsam

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