John Chris
·The cal. 135 is also the only Zenith wrist chronometre that was designed and built from the ground up as a chronometer for entry in the Swiss observatory chronometer competitions (in the 30mm and under category that was open to wrist watches). Its designer, the celebrated Ephrem Jobin, is, as far as I know, still alive at 102. It won a record 5 straight first prizes, from 1950 through 1954. Only the final production included a version (the "Zenith 2000") that was not marked "Chronometre", well after movement production had ceased - presumably as it had by then gone a bit down-market (being assembled from previously manufactured parts and finished to a lower standard), and was no longer sent to the COSC for chronometer certification. Amusingly, I saw a Zenith 2000 offered for sale on Chrono24 at a very high price, described as a particularly rare cal. 135 because it was NOT signed "Chronometre"! The 2000 is, of course, a very worthy watch, but surely not more so than its more upscale older siblings.
Chris
Chris