@martinc ... 1) The UG brain trust has been called to weigh in. 2) this is a rare bird 3) these threads form part of a valuable data base here on OF. 4) pictures are critical to answering a question like yours.
Thanks,
@Larry S !
I understand perfectly the importance of pictures. I hope those two help.
In this case I am really asking more in general, although yes - I obviously have a particular watch in mind - the one in the pictures.
My own research led me to older discussions saying that known Contaxes are in the S/N range approx. 605XXX - 620XXX. I have only seen a few with serial numbers visible and they were mostly 607XXX.
(For example here:
https://catalog.antiquorum.swiss/en/lots/lot-216-258 , here:
https://www.kaplans.se/en/auktioner/3218/vara/1320838 , or here:
https://www.officechronograph.com/manufactures/universal-geneve-contax/ )
The one sold at Phillips in 2015 was a 630XXX:
(
https://www.phillips.com/detail/universal/CH080515/238 )
One discussed in 2007
here was a 633XXX.
I have noticed here on OF that
@Florent has 2 examples, but I didn’t find any info on serial numbers. I have seen a few more on Instagram, but no info on serial given...
587XXX seems a bit too early to me... but if it is a 1936 serial, there might be some possibility the case(back) is correct. I have no doubts about the dial (maybe except the hour+minute hands, which definitely are relumed, but quite possibly not original at all).
On a Watchuseek forum I have found a copy of the original patent for Contax, which was placed in 1936. The name Contax was registered in 1935.
In Sala there are a lot of watches dated before 1937, when the brand name “Universal Geneve” was registered, which have their dials marked “Universal Geneve” (e.g. pages 120, 123, 134, 140, 141, 142 - all Compurs, obviously), something that should theoretically be impossible, as such a brand name did not exist at that point in time...
The oldest Compax in Sala is S/N 645XXX dated to 1937.
Thanks!