Many years ago I found this watch on ebay from a dealer in Portugal. Since I like thin, handwinding watches with a small second-hand and Breguet hairspring, I was fascinated by this one and bought it for a reasonable price.
After I received it, I gave it to a watchmaker for a complete overhaul. The watchmaker told me that it was still in very good condition and he did not had to replace any parts.
I was wearing it for some time, when one day it suddenly stopped. I gave it to the watchmaker again and he could fix the problem at no cost. He did not tell me what the problem was.
Soon, many new watches joined my collection and this one disappeared, carefully packed, inside a drawer.
In the meantime, I learned to overhaul watches by myself, bought all necssary tools, cleaning equipment, oils and greases, etc., etc.
After many years, I re-discovered this Gruen watch and decided to bring it to life again.
I carefully disassembled it, checked the parts for wear and tear and decided to order a new mainspring, since the old, blued steel mainspring was pretty short and showed some small signs of corrosion. I also found the setting lever spring broken and missing. This could had been the reason why the watch stopped years ago. I was lucky to have found a NOS-one from a dealer in Germany.
I especially had to take great care of the Breguet balance-spring, because the blued steel does not forgive if streched too strong during handling and cleaning.
I have to apologize for the pictures taken with my smartphone. I shall not take photos without sufficient light!
You can clearly see the broken and missing part of the setting lever spring.
The gear train as in a watchmaker´s schoolbook.
The old, blued steel mainspring. The barrel was still in good condition.
After re-assembling all the parts, including the new mainspring and setting lever spring, carefully oiling and greasing (a little less is better than too much), the watch runs pretty good at approx. +10 sec./day with amplitudes between 230 – 275 degrees. The beat error could be better, but manually turning the hairspring-collet and adjusting it by just 2 milliseconds is almost impossible.
A simple but classic wristwatch with a good quality movement from 1958.
The chromium plated case is still in perfect condition and shows no signs of abrasion.
This particular one must have been a gift for a 10-year-anniversary. Unfortunately I can´t read the Cyrillic letters in order to translate it.
If anyone know what it means, please let me know!