The Zenith 135 movement was designed to compete in the Neuchâtel Observatory competitions for precision time keepers, the rules stipulated a maximum movement diameter of 30mm and height of 5mm. To maximise the performance within these constraints, Ephrem Jobin the designer sought to incorporate the largest possible balance wheel (all other things being equal a larger balance will perform more accurately). The large balance is clear in the images of the movement - it occupies nearly half the width of the movement.
The movement was a triumph for Zenith, it won an unprecedented five consecutive Neuchâtel Observatory chronometry prizes from 1950 to 1954. In all, the movement garnered about 200 honors, two-thirds of which were first prizes. There is an excellent article on the development of the cal 135 here
The movement has been fully serviced and regulated, the performance, even after 50 years is superb. The case has been ultrasonically cleaned, but like all our vintage watches we have left it unpolished. It is supplied with a new Hirsch leather strap. This is a very fine watch and will bring many years of happiness and pride to the owner.
Case diameter (excluding winding crown): 37mm
Case material: Stainless steel
strap width: 18mm
time keeping: grade A+
Please allow a little extra time to receive your order through January. We aim to have all orders dispatched within 1-2 working days, however we are experiencing some internal delays due to local lockdown restrictions.
We aim to dispatch all orders placed before 12pm (GMT), on the same day working day. Where this isn't possible, we will inform you via email as soon as possible.
When your order is dispatched you will be emailed the tracking details.
Please allow a little extra time to receive watches with engravings, these may take up to 10 working days.
Shipping guide for watches:
UK: FREE next working day delivery with DPD
United States & Canada: FREE Fedex shipping, 1-2 working days
Clocks, straps, bags (unless purchased with a watch):
Free Royal Mail shipping, 5-14 working days (depending on location)
Please note, during busy sale periods dispatch may take a little longer (this is quite rare). These delivery times are a guide based on the DPD, Fedex and Royal Mail terms of service, products may, in some unusual cases take longer to arrive. If this happens, please get in touch.