This timepiece is a magnificent artifact from November 1972, as confirmed by the serial number 21110336. The Cosmotron is defined by its ultra-high-frequency performance and a breathtaking gradient emerald sunburst dial that shifts beautifully from deep teal to a vivid forest green. It is powered by the legendary Caliber 7802, a mechanical-electronic hybrid that beats at a staggering 36,000 BPH (ten beats per second). This ensures a sweep second hand so smooth it rivals the finest Swiss chronometers, all while utilizing a transistorized circuit to maintain a traditional balance wheel's heart.
The architecture is quintessentially bold 70s luxury, utilizing a polished stainless steel cushion case with an integrated-style lug design that offers a commanding, futuristic presence on the wrist. The dial is a work of high-end JDM art, featuring hand-applied baton indices, a unique Kanji/English day-date wheel at 3 o'clock, and the iconic "CTZ" electronic logo. Flipping the watch over reveals the crisp caseback engravings and the GN-4W-S designation, definitively confirming its authentic Japanese Domestic Market (JDM) heritage. This is an essential acquisition for an elite collector who appreciates transistorized history, the soul of a 36,000 BPH heart, and the bold, shimmering presence of the Citizen Cosmotron.
