Hamilton

Frogman Auto

Reference Number :

H77455331

Series : Khaki Navy

Retail: $1,295

(As of: 06/2025)

This watch is not for sale, this page is just for reference purposes only. If you would like to purchase this watch, please contact Hamilton. If you are interested in selling this watch to us, you can contact us here.

Quick TakeSome watches whisper about past adventures; the Frogman is shouting, ready for the next one. This isn't a delicate accessory; it's a purpose-built instrument that feels absolutely solid on the wrist. The 41mm steel case is the perfect size, substantial without being clumsy, and that robust crown guard is a clear statement of intent. You can almost feel the satisfying click of the screw-down crown as you seal the case, knowing the H-10 movement inside is safe and sound down to a crushing 300 meters. With an 80-hour power reserve, it's the reliable friend that's still ticking after being left on the nightstand for a three-day weekend. The high-contrast black dial with its pop of orange isn't just for style; it’s about instant, life-saving legibility when every second counts. It’s a tool, through and through, from the anti-reflective sapphire crystal to the grippy rubber strap that feels like it was molded for a wetsuit. This watch doesn’t belong in a box; it belongs on the water.

DescriptionThe H77455331 model is engineered with a focus on durability and underwater performance. Its case, measuring 41mm in diameter, is machined from solid stainless steel, providing substantial protection for the internal components. Atop the case sits a sapphire crystal, selected for its high scratch resistance, which has been treated with an anti-reflection coating to ensure maximum dial legibility under various lighting conditions. A critical feature for its diving application is the screw-down crown, which contributes significantly to its water resistance rating of 30 bar. This pressure rating is equivalent to 300 meters or 934.2 feet, verifying its capability for serious aquatic activities. The unidirectional rotating bezel allows for the tracking of elapsed time, a fundamental requirement for safe diving operations.

Internally, the timepiece is driven by the Hamilton Caliber H-10, an automatic mechanical movement. This three-hand caliber provides an extended power reserve of 80 hours, a considerable advantage over standard automatic movements. The inclusion of a Nivachron balance spring enhances the movement's resistance to magnetic fields, temperature variations, and shocks, thereby improving its overall timekeeping stability and reliability. The black dial is designed for clarity, with prominent markers and hands. The watch connects to the wrist via a 20mm rubber strap, identified by reference H6000001521, which terminates in a steel pin buckle with a width of 18mm, ensuring a secure and comfortable fit during demanding use.

GenderMen

SignaturesHamilton

Country of OriginSwitzerland

Case Size41 mm

MovementAutomatic

CaliberH-10

FunctionsHours, Minutes, Seconds

Power Reserve80 Hours

Case MaterialsStainless Steel

Bezel MaterialsStainless Steel

Lug MaterialsStainless Steel

CrownScrew Down