Hamilton

Railroad Lady Auto

Reference Number :

H40405191

Series : American Classic

Retail: $1,295

(As of: 07/2025)

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 TakeForget just telling time; the Railroad Lady Auto is a conversation on your wrist. It's got this incredible mother of pearl dial that plays with the light, shifting from pearly white to hints of rainbow depending on how you move. It is like each watch has its own secret personality. Then you get the little pop of blue from the hands against the sparkle of the diamond hour markers—it is just a fantastic detail. But this is not just a pretty face. Flip it over, and the open case back reveals the living, breathing heart of the watch: a Swiss automatic movement. You can literally watch the gears turn and the rotor spin, a constant reminder of the incredible engineering tucked inside. It feels substantial, with the cool weight of the steel bracelet, but the 32mm size keeps it from being overwhelming. It is the perfect blend of vintage railroad heritage, modern mechanics, and a touch of glamour that does not try too hard. It is a watch for someone who appreciates the story behind the mechanics as much as the sparkle on the dial.

DescriptionThe Hamilton American Classic Railroad Lady Auto, identified by reference number H40405191, is a mechanical timekeeping instrument engineered with specific material and dimensional parameters. Its case is constructed from 316L stainless steel, a durable alloy chosen for its high resistance to corrosion and its hypoallergenic properties. The case exhibits a circular geometry with a precisely machined diameter of 32mm, a dimension that establishes a classic profile on the wrist. The overall vertical dimension, or thickness, is 11.3mm, a measurement that reflects the spatial requirements of the internal automatic caliber while maintaining wearability. Protecting the dial is a synthetically grown sapphire crystal, which possesses a Mohs hardness rating of 9, rendering it virtually immune to scratches from everyday contact. To optimize visual acuity, this crystal is treated with an anti-reflective coating on at least one surface, minimizing specular reflection and maximizing light transmission for uncompromised legibility. The lug width is specified at 16mm, dictating the interface point for the bracelet and providing a standard size for potential strap alternatives. The case architecture also includes an exhibition-style, or open, case back, sealed with a secondary crystal to allow visual inspection of the movement within.

Powering the H40405191 is the ETA Caliber 2681, a robust and reliable self-winding mechanical movement manufactured in Switzerland. This caliber operates on the principle of converting the kinetic energy generated by the wearer's arm movements into potential energy stored in the mainspring, thereby eliminating the need for daily manual winding. The movement's design incorporates a system of gears, jewels, and springs calibrated for consistent performance. Upon reaching a fully wound state, the mainspring provides a power reserve of approximately 43 hours, enabling the watch to maintain continuous operation for nearly two days off the wrist. The functionality of the timepiece is further defined by its water resistance rating, certified to 5 bar. This pressure rating is equivalent to the static pressure at a water depth of 50 meters or 73 pounds per square inch (psi), ensuring the integrity of the case seals against ingress from rain, splashes, and accidental short-term immersion. The presence of the open case back offers a direct view of the caliber's oscillating weight, balance assembly, and decorative finishing, which are hallmarks of traditional watchmaking craftsmanship and serve as a testament to the complex engineering housed within the stainless steel chassis.

GenderWomen

SignaturesHamilton

Country of OriginSwitzerland

Case Size32 mm

MovementAutomatic

CaliberETA 2681

FunctionsHours, Minutes, Seconds, Date

Power Reserve43 Hours

Case MaterialsStainless Steel

Bezel MaterialsStainless Steel

Lug MaterialsStainless Steel

Case BackSapphire Crystal