Citizen TSUYOSA 60 40mm Automatic Watch #NK0024-54X

Model Reference: NK0024-54X

Overview
The Citizen Tsuyosa NK0024-54X is a refined, mechanical timepiece that represents the "Modern Classic" branch of the Tsuyosa collection. While the series is famous for its bold colors, this specific model leans into a luxurious bicolor aesthetic with a forest green sunray dial. It features a classic round 41mm case that trades the integrated sport-bracelet look for more traditional lugs, allowing for a highly polished, jewelry-like presence. It is a watch that emphasizes mechanical substance, housing a high-spec automatic movement within a sophisticated, two-tone frame.

Technical Specifications

Case Size: 41mm (Balanced, traditional round profile)

Case Material: Bicolor (Silver-tone and Rose Gold-tone) Stainless Steel

Movement: Caliber 8310 Mechanical (Automatic, self-winding with a 60-hour power reserve and hacking/stop-seconds functionality)

Crystal Type: Box-Shaped Mineral Crystal (Double-domed for a vintage look and enhanced dial depth)

Water Resistance: 50 Meters (5 ATM / 165 feet) — Suitable for daily wear and light swimming

Dial: Sunray emerald green with rose gold-tone "dagger" indices and sharp "Dauphine" hands

Bezel: Fixed, polished rose gold-tone stainless steel

Strap: Bicolor silver and rose gold-tone stainless steel link bracelet with a fold-over clasp

Special Features

High-Performance 8310 Movement: A standout in the Tsuyosa range, this caliber provides a 60-hour power reserve, significantly longer than the standard 40-42 hours found in many other mechanical watches.

Box-Style Crystal: The raised, "box" crystal creates a unique side profile and a distinct vintage aesthetic that catches light across the green sunray dial.

Exhibition Case Back: A transparent window allows you to see the 21-jewel automatic movement and its rotor in motion.

Bicolor Sophistication: The use of rose gold-tone on the bezel, crown, and center links creates a high-contrast, premium look against the silver-tone steel and green dial.

Hand-Winding & Hacking: Allows for precise time-setting by stopping the second hand when the crown is pulled out, along with the ability to manually wind the mainspring.