Jaeger-LeCoultre

quattro
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20804

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Here’s what I found as an explanation

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.