I recently asked JLC if I could get some update on the restoration of my grandfather's watch.
The Manufacture didn't answer yet, but, in the meantime, I saw online the other day this steel Uniplan Etrier: same model as my grand-father's watch, but in a sportier variant.
Beautiful, isn't it?
Best, Emmanuel
Dimensions : 37 x 24 mm - Calibre 437 JLC - Hermes lizard strap with original Wenger buckle
I imagine the mechanism is fairly straightforward to the extent any good watchmaker could probably give it a good overhaul. I was going to send my Zenith from the 1930s back to Zenith in Switzerland for service, but they wanted a few thousand dollars and told me it would take several months. I found a local watchmaker who did it in three weeks for just a few hundred dollars. It is running perfectly.
That's a part of what's great with these simpler timepieces!
By: quattro : December 21st, 2025-18:54
The restoration of my grandfather's watch is a bit costly, but so much was wrong about it (wrong hands and crown, no seconds hand) that I wanted it to be done.
of the waterproof (aqua) and medical (medico) nature of these Croton:
Medical Characteristics
1. High-Legibility Dial • Large Arabic numerals and strong contrast (often two-tone dials) for quick reading in low light. • Lumed syringe-style hands and luminous numerals for visibility during night shifts or emergencies.
2. Center Seconds Hand • Essential for timing a patient’s pulse accurately. Doctors would count beats over a fixed interval (e.g., 15 or 30 seconds) using the seconds track.
3. Outer Seconds/Minute Track • A full chapter ring with clear tick marks allowed precise measurement of short intervals, critical for pulse and respiration checks.
4. Robust Waterproof Case • Rectangular “tank” or clamshell-style case designed to withstand hospital or field conditions, including exposure to water and disinfectants.
5. Military and Medical Heritage • Issued or favored during WWII and even the Korean War for army medics, reinforcing its reputation as a functional medical instrument.
Unlike some later doctor’s watches, most Croton Aquamedico models did not feature a dedicated pulsometer scale. Instead, they relied on the center seconds hand and outer track for manual pulse timing.