{"product_id":"citizen-collection-mechanical-open-heart-japanese-mens-wristwatch","title":"Citizen Mechanical Watch Collection Open Heart Men's Wristwatch","description":"\u003cp style=\"text-align: left;\"\u003eThe Citizen Collection Mechanical Open Heart is a four-model lineup of Japanese-made automatic watches released in August 2026, marking Citizen's latest entry in its core mechanical collection. Built on the Caliber 8229 automatic movement — 21 jewels, ~42-hour power reserve, hand-winding and hacking supported — these watches offer a strong blend of classic and modern design without compromising on finish or character. The defining feature is the open-heart aperture at 7 o'clock, through which the balance wheel can be observed in motion — the literal heartbeat of the watch made visible. The 41mm stainless steel case pairs a slightly wider bezel and lug with mirror-polished cut surfaces on the bezel and beveled bracelet centre links, creating a dynamic interplay of light that changes with every shift of the wrist. The index cut parts are thick for visual presence but thinly finished on the flat plane for a refined, delicate edge. A see-through caseback reveals the movement from behind. Four variants: Silver (NH9150-52A), Black (NH9150-52E), Blue (NH9150-52L), and Silver\/Gold Two-Tone (NH9154-51A). Made in Japan.\u003c\/p\u003e\n\u003ch2\u003eKey Features:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen-Heart Aperture at 7 O'Clock\u003c\/strong\u003e: A window in the dial at the 7 o'clock position puts the balance wheel on full display — the component responsible for regulating the movement's timekeeping, oscillating back and forth up to six times per second. It's mechanical watchmaking made tangible on the wrist.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCitizen Caliber 8229 — Automatic + Manual Winding, Hacking\u003c\/strong\u003e: The 8229 is a solid everyday automatic caliber: 21 jewels, approximately 42 hours of power reserve on a full wind, manual winding capability, and a hacking seconds hand that stops for accurate time-setting. Mean daily rate of -20 to +40 seconds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror-Finished Bezel Cuts \u0026amp; Beveled Bracelet Links\u003c\/strong\u003e: The cut surfaces of the bezel and the angled faces of the bracelet centre links are mirror-polished, creating a sharp contrast against the brushed surfaces and a dynamic appearance that shifts with the light — a finishing detail that punches well above the price point.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSee-Through Caseback\u003c\/strong\u003e: The movement is visible from the rear through a see-through caseback, allowing the full caliber to be appreciated from both front and back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 Bar Water Resistance \u0026amp; Made in Japan\u003c\/strong\u003e: The 41 x 11.7mm stainless steel case is rated to 100 metres (10 bar) of water resistance — more than sufficient for everyday wear and light water activities. Made in Japan, with a Citizen manufacturer's warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWatch Specifications\u003c\/h2\u003e\n\u003ctable style=\"border-collapse: collapse;\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eCitizen Collection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModels\u003c\/td\u003e\n\u003ctd\u003eNH9150-52A (Silver), NH9150-52E (Black), NH9150-52L (Blue), NH9154-51A (Silver\/Gold)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMovement\u003c\/td\u003e\n\u003ctd\u003eAutomatic + Manual Winding (Caliber 8229)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJewels\u003c\/td\u003e\n\u003ctd\u003e21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Reserve\u003c\/td\u003e\n\u003ctd\u003e~42 hours (fully wound)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e-20 to +40 sec per day\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase Material\u003c\/td\u003e\n\u003ctd\u003eStainless Steel \/ Mineral Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase Size\u003c\/td\u003e\n\u003ctd\u003e41mm diameter, 11.7mm thick\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSee-Through Caseback\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBand Material\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Resistance\u003c\/td\u003e\n\u003ctd\u003e100m (10ATM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct File\u003c\/strong\u003e\u003cbr\u003eBrand: \u003ca href=\"https:\/\/thejapanesefactory.com\/collections\/citizen\"\u003eCitizen\u003c\/a\u003e\u003cbr\u003eProduct: \u003ca href=\"https:\/\/thejapanesefactory.com\/collections\/wristwatch\"\u003eWristwatch\u003c\/a\u003e\u003cbr\u003eMovement: \u003ca href=\"https:\/\/thejapanesefactory.com\/collections\/automatic-movement\"\u003eAutomatic\u003c\/a\u003e\u003cbr\u003eDisplay: \u003ca href=\"https:\/\/thejapanesefactory.com\/collections\/analog-display\"\u003eAnalog\u003c\/a\u003e\u003c\/p\u003e","brand":"Citizen","offers":[{"title":"NH9150-52A — Silver","offer_id":48117614575846,"sku":null,"price":47300.0,"currency_code":"JPY","in_stock":true},{"title":"NH9150-52E — Black","offer_id":48117614608614,"sku":null,"price":47300.0,"currency_code":"JPY","in_stock":true},{"title":"NH9150-52L — Blue","offer_id":48117614641382,"sku":null,"price":47300.0,"currency_code":"JPY","in_stock":true},{"title":"NH9154-51A — Silver\/Gold Two-Tone","offer_id":48117614674150,"sku":null,"price":55200.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0702\/8119\/9846\/files\/CTC_NH9150-52A_00_EC.png?v=1785913389","url":"https:\/\/thejapanesefactory.com\/products\/citizen-collection-mechanical-open-heart-japanese-mens-wristwatch","provider":"The Japanese Factory","version":"1.0","type":"link"}