1960 Zenith S.58 First Series Cal.120

A rare bird - diver's watch introduced by Zenith in 1958 (probably to commemorate geophysics year). The model index is S.58 where S stands for "Super" talking about waterproof capabilities and 58 stands for the year. There is an opinion that the complete first batch of 1200 pieces were entirely purchase by Cairelli for Italian navy.

This particular first series piece was among the last produced before Zenith switched to the next generation in 1960. It features manual-winding Cal.120 with hacking feature, durable 37 mm steel case without rotating bezel and with screw-down caseback.

The watch went through complete service in October 2016.

Manufacturer: Zenith, Switzerland
Model: S.58
Reference: n/a
Type: Manual-winding diver's watch
Year of production: ca.1960 (ca. according to movement serial number)
Case type: 2-body, with screw-down caseback, high-polished finishing and flat bezel.
Case material: Stainless steel
Case measurement: 37 mm (without crown) / 46 mm (lug-to-lug) / 20 mm (between lugs)
Case serial number: 946172
Case back: Screw-down, signed "S.58" on the outter part of the caseback. Unsigned on the inner part.
Crown/pushers: Steel fluted crown. 
Crystal: Acrylic
Movement type: Manual-winding movement with hacking feature
Movement model: Zenith Cal.120, signed "Zenith Swiss Made". 18 jewels, 18000 A/h, 48 hours of power reserve, incabloc shock-protection.
Movement serial number: 4916651
Dial: Silver-white dial decorated with black printed minutes track on the outer perimeter, raised luminous golden hour markers. Reflective golden printed Arabic numerals at quarters. Signed "Zenith" at 12 o'clock and bears golden raised star logo. Signed "S.58" and "Swiss" at 6 o'clock. 
Hands: Golden luminous hour and minute hands, golden sweep seconds hand with luminous pointer.
Case condition: 2 (fine). Most likely unpolished. Very strong and sharp edges and geometry. 
Movement condition: 1 (mint) professionally serviced in October 2016. Adjusted and keeps good time. All functions work properly.
Dial/hands condition: Near-mint original untouched dial. Shows light aging on the edge near 9 and 3 o'clock. Original untouched hands showing certain oxidation.
Overall condition: 1 (mint) - 2 (fine)
Delivery set: The watch comes with brand-new genuine leather strap or neylon NATO strap and generic steel buckle. Along with our company’s warranty certificate, general terms and conditions of sale, our company’s box.
Warranty: 1-year technical warranty

Collections: Archive

Category: Zenith

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Measuring a watch

It is always crucial to understand the size of the watch, especially when it comes to vintage watches which are generally considered as too small in comparison with what watch industry offers today. For example, the original Patek Philippe Calatrava introduced in the 1930s was only 31 mm in diameter, while today's classic Calatrava is 39 mm. When you think about 8 mm, it doesn't seem to be a big difference, but believe it is.

In our condition reports we normally disclose three most important parameters as follows: diameter without crown / lug-to-lug length / lug width. 

Diameter without crown

It is, so far, the most important measurement to understand the size of a regular round-shaped watch.It helps you to understand proportions and overall look of the watch. It is important to consider width of the bezel and color of the dial, because certain combinations may make the watch look bigger, while some other smaller. It is all very individual, however there is common understanding:

Lug-to-lug width

This parameter will help you to understand whether the watch is comfortable for wearing. You should compare lug-to-lug width with the width of your wrist, and if lug-to-lug width is smaller or equal, then this watch shall be comfortable.

Lug width

This measurement is defining what size of strap you need for the particular watch. Depending on era and manufacturer you can find watches with lug width between 14 mm and 24 mm. Most common sizes are 18 mm and 20 mm.