Citizen Eco-Drive Pilot Chronograph Perpetual Calendar E820-R009125/BL5401-09E – WR100 – 18cm

Vault 066 | Archive Signature | 18cm max wrist Citizen’s proper aviation-style Eco-Drive pilot chronograph with the E820-R009125 module (commonly sold as BL5401-09E). A busy, functional cockpit dial: chronograph timing, perpetual calendar, alarm and multi-mode display, plus the slide-rule calculation scales pilots actually used for quick conversions. Specs / functions:Citizen Eco-Drive solar-charged quartz (charges from light) Perpetual calendar + date window Chronograph timing mode Alarm + multi-mode selector at 6 o’clock Pilot slide-rule scale / aviation conversions WR100 / 10 bar (not pressure tested) Condition (Archive Signature): Crisp, high-contrast dial with great legibility. Case shows honest wear consistent with careful use (see photos). Strap is wearable but shows wear on the underside. Fit / strap: Fits up to 18cm wrist as pictured. Citizen signed buckle. Included: Watch as photographed. This is one of those watches that feels like a miniature instrument panel. I like that Citizen didn’t just style it like a pilot watch they actually packed it with the practical functions: the mode wheel, the perpetual calendar and that slide-rule ring that makes you want to learn a few cockpit calculations just for the fun of it. It’s pure “tool-watch” energy, but still smart enough to wear daily.