Rare 1972 Citizen Cosmotron Special 7803 Electronic Hi-Beat JDM Watch – Midnight Blue Gradient Dial, External Battery Hatch & Sync Pusher

Citizen mechanical wristwatch

MADE IN JAPAN

The Citizen Legacy: A Pioneer of Precision
Founded in 1918, Citizen is now one of the largest watch and movement groups in the world. The Japanese brand is known for its highly accurate and reliable Eco-Drive solar-powered watches. The Citizen group owns Bulova, Alpina, Frederique Constant, and Arnold & Son, as well as movement manufacturers Miyota and La Joux-Perret.

🕰️ A Revolution in Horological History: The Citizen Cosmotron Series

Before quartz took full control of the watch market, a brilliant, short-lived era of horology birthed the hybrid electromechanical watch. The Citizen Cosmotron represents the pinnacle of this technological transition. Combining the mechanical soul of a traditional escapement with the flawless precision of a battery-powered transistorized circuit, this series delivered a mesmerizing, perfectly smooth second-hand sweep that purrs at a true high-beat frequency. It is a rare, historically significant milestone highly coveted by vintage Japanese Domestic Market (JDM) enthusiasts.

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Description

This stunning Japanese Domestic Market (JDM) Citizen Cosmotron Special features a deeply dramatic midnight blue-to-black sunburst gradient dial that shifts exquisitely from electric indigo to ink black depending on the angle of light. Housed in an aggressively styled, sharp asymmetric stainless steel case, this specific reference is distinguished by its incredibly rare tool-less external battery hatch on the case back, allowing the owner to replace cells without removing the back plate. It comes fitted to its original multi-link stainless steel bracelet with a signed Citizen clasp.

Powered by the elite Caliber 7803A running at a blistering 36,000 beats per hour, this watch is packed with complications. Aside from Citizen’s signature gravity-based day/date quickset (pushing the crown to shift calendars based on watch orientation), it features a prominent secondary pusher button at the 8 o’clock position. This button acts as an instantaneous time-synchronization feature—pressing it instantly snaps the second hand straight back to the 12 o’clock mark for precise, on-the-second time matching.

Technical Details

• Brand: Citizen

• Model: Cosmotron Electronic “Special”

• Reference Number: 7800-870018 TA / Case Code 60-5051

• Movement Caliber: 7803A (Transistorized balance motor with secondary stop/sync train)

• Jewels: 8 Jewels

• Frequency: 36,000 bph (Hi-Beat)

• Case Size: 38 mm (excluding crown)

• Lug-to-Lug: 42 mm

• Lug Width: 18 mm

• Case Material: Stainless Steel with Asymmetric Profile

• Case Back Features: Threaded lock ring with dedicated coin-slot external battery hatch

• Bracelet Material: Original Stainless Steel

• Calendar: Day/Date window at 3 o’clock (Dual Language Kanji/English)

• Complications: Gravity-based push-crown quickset, 8:00 second-reset/synchronization pusher

• Country of Manufacture: Japan

Watch went through a complete service by a professional watch tech and keeps good time.

Comes complete with original steel bracelet*.

(*)Note: Stock bracelets are often shortened by previous owners and may not fit you(see bracelet size in the product images). We recommend adding a new Citizen lug width matched leather strap with your order.

Why Collectors Seek This Specific Cosmotron

• The Transition Era Hybrid: It captures a rare, short-lived moment in horology when mechanical balance wheels were powered by transistors, bridging the gap between traditional mainsprings and modern quartz.

• Liquid-Smooth 36,000 BPH Sweep: Running at 10 beats per second ($36,000\text{ vph}$), the second hand glides across the dial with a mesmerizing fluid motion rarely seen in battery-powered timepieces.

• The Gravity-Defying Quickset: It features one of watchmaking’s most unique complications—pushing the crown changes the date when held upright, and changes the day (Kanji/English) when flipped upside down.

• Highly Desirable External Battery Hatch: Unlike standard vintage watches, this rare case back architecture features a dedicated, coin-slot battery door allowing for effortless battery swaps without disturbing the movement or gaskets.

• On-The-Second 8 O’Clock Sync Pusher: The ultimate mechanical gimmick for timing accuracy; pressing the 8 o’clock button instantly flies the second hand back to zero, allowing you to calibrate the watch perfectly with atomic time signals.

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The Spirit of Innovation: The Citizen Legacy
Founded in 1918 with the mission of creating timepieces that are “Citizens” of the world, the Citizen Watch Company has spent over a century redefining the boundaries of horology. From its origins as the Shokosha Watch Research Institute, the brand has remained steadfast in its philosophy: “Better Starts Now.” This belief—that it is always possible to make something better—transformed a local Japanese workshop into a global powerhouse of precision and craft. By controlling the entire manufacturing process in-house, from the individual components to the final assembly, Citizen ensures an uncompromising standard of quality that few manufacturers on earth can match.
What truly sets Citizen apart is its relentless pursuit of pioneering technology paired with environmental consciousness. The brand made history by introducing the world’s first light-powered watch, the Eco-Drive, which eliminated the need for battery replacements and forever changed the industry’s approach to sustainability. Beyond its eco-friendly milestones, Citizen’s history is decorated with “world firsts,” including the first professional diving watch with an electronic depth sensor and the most accurate satellite-synchronized timekeeping systems. When you wear a Citizen, you aren’t just wearing a watch; you are wearing a piece of history engineered for the future.
Why Choose Citizen?

• In-House Excellence: Every movement is manufactured vertically within their own Japanese facilities.
• Eco-Drive Technology: Powered by any light source, ensuring your watch never stops and never needs a battery.
• Heritage of Firsts: A century-long track record of technical breakthroughs in durability and precision.