{"product_id":"citizen-collection-open-heart-nh9150-52a-mens-watch","title":"Citizen Collection Open Heart NH9150-52A Men's Watch","description":"\u003cp data-path-to-node=\"6\" id=\"p-rc_699691de2ef2d179-529\"\u003e\u003cspan class=\"citation-2285\"\u003eThe \u003c\/span\u003e\u003cspan class=\"citation-2285\"\u003eCitizen NH9150-52A\u003c\/span\u003e\u003cspan class=\"citation-2285\"\u003e (cataloged within the prestigious \u003c\/span\u003e\u003cspan class=\"citation-2285\"\u003eCitizen Collection \/ Mechanical Open Heart Series\u003c\/span\u003e\u003cspan class=\"citation-2285 citation-end-2285\"\u003e) is an authoritative, high-performance Japanese automatic mechanical sport-dress timepiece.\u003csup class=\"superscript\" data-turn-source-index=\"1\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e Engineered for discerning horological purists who appreciate the raw, living architecture of mechanical movements paired with clean monochromatic execution, this reference delivers a compelling balance between contemporary athletic wrist presence and refined neoclassical minimalism. \u003cspan class=\"citation-2284\"\u003eAcross international watch forums, Japanese Domestic Market (JDM) collector circles, and everyday carry (EDC) communities, it has earned defining community nicknames—the \u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e\"Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e, \u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e\"Silver Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e, \u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e\"Steel Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e, \u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e\"Sporty Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e, \u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e\"Mechanical Heart 41\"\u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e, or \u003c\/span\u003e\u003cspan class=\"citation-2284\"\u003e\"Monochrome Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-2284 citation-end-2284\"\u003e—for its prominent open-heart balance wheel aperture at 9 o'clock, radiant silver sunray dial plate, all-stainless-steel construction, exhibition screw-down caseback, and robust 100-meter water resistance rating.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-2283 citation-end-2283\"\u003eIt unites a sculpted 316L solid stainless steel case in a versatile 41.0mm diameter with an evocative silver dial, faceted applied silver-tone indices, an in-house Japanese automatic caliber, durable crystal glass, and an integrated solid stainless steel construction.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e Perfectly calibrated for corporate executives, creative professionals, and mechanical watch collectors seeking a pure, monochromatic daily timepiece that transitions effortlessly from formal boardroom meetings and tailored suits to celebratory dinners and active weekend wear. \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003eThe defining visual centerpiece of this NH9150-52A reference is its captivating open-heart dial architecture. Anchored at the 9 o'clock position is a circular skeletonized window that offers an intimate, uninterrupted view of the beating balance wheel and pallet fork in continuous mechanical motion. Finished in an ultra-fine silver sunburst radial brushing, the dial plate catches ambient light across dynamic silvery gradients. Circling the outer perimeter is a stepped chapter ring marked with precise black minute demarcations for down-to-the-second legibility. Prominent three-dimensional, applied silver-tone faceted baton hour indices line the hour positions, diamond-cut and treated with high-performance luminescent compound to ensure effortless readability in low-light environments. Broad silver-tone sword-style hour and minute hands sweep authoritatively across the dial alongside a needle-thin central sweep seconds hand. \u003cspan class=\"citation-2282 citation-end-2282\"\u003eFraming the dial is a fixed solid stainless steel bezel with a slightly thickened profile and mirror-polished angled chamfer that accentuates the case’s athletic shoulders and downward-sloping lugs.\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003cspan class=\"citation-2281\"\u003eBeneath its tailored exterior, the watch is driven by Citizen’s in-house \u003c\/span\u003e\u003cspan class=\"citation-2281\"\u003eCalibre 8229\u003c\/span\u003e\u003cspan class=\"citation-2281 citation-end-2281\"\u003e Japanese automatic mechanical movement, engineered and manufactured at Citizen’s dedicated horological facilities in Japan.\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-2280\"\u003eBeating at a steady frequency of 21,600 vibrations per hour (3 Hz), this 21-jewel self-winding caliber harnesses the natural kinetic motion of the wearer’s wrist to wind the mainspring, delivering approximately \u003c\/span\u003e\u003cspan class=\"citation-2280\"\u003e40 to 42 hours of autonomous power reserve\u003c\/span\u003e\u003cspan class=\"citation-2280 citation-end-2280\"\u003e on a full wind.\u003csup class=\"superscript\" data-turn-source-index=\"6\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e In addition to automatic rotor winding, the Calibre 8229 features convenient manual hand-winding capability through the crown, allowing the wearer to wind the movement smoothly after periods of rest. \u003cspan class=\"citation-2279 citation-end-2279\"\u003eThe caliber is equipped with a hacking seconds (stop-seconds) mechanism that halts the seconds hand when the crown is pulled out, enabling down-to-the-second time synchronization.\u003csup class=\"superscript\" data-turn-source-index=\"7\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-2278\"\u003eBuilt with Citizen’s proven shock-resistant balance architecture and Japanese Industrial Standard (JIS) Class 1 anti-magnetic resistance (4,800 A\/m), the movement defends timekeeping precision against everyday magnetic fields from laptops and mobile devices, maintaining a reliable factory static tolerance of \u003c\/span\u003e\u003cspan class=\"citation-2278\"\u003e-20 to +40 seconds per day\u003c\/span\u003e\u003cspan class=\"citation-2278 citation-end-2278\"\u003e.\u003csup class=\"superscript\" data-turn-source-index=\"8\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003cspan class=\"citation-2277\"\u003eThe case is engineered with substantial, contemporary sports-dress proportions, measuring an official \u003c\/span\u003e\u003cspan class=\"citation-2277\"\u003e41.0mm in case diameter\u003c\/span\u003e\u003cspan class=\"citation-2277\"\u003e with a case profile thickness of \u003c\/span\u003e\u003cspan class=\"citation-2277\"\u003e11.7mm\u003c\/span\u003e\u003cspan class=\"citation-2277\"\u003e, an interhorn lug width of \u003c\/span\u003e\u003cspan class=\"citation-2277\"\u003e22.0mm\u003c\/span\u003e\u003cspan class=\"citation-2277\"\u003e, and a total weight of approximately \u003c\/span\u003e\u003cspan class=\"citation-2277\"\u003e141.0 grams\u003c\/span\u003e\u003cspan class=\"citation-2277 citation-end-2277\"\u003e.\u003csup class=\"superscript\" data-turn-source-index=\"9\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e The watch sits exceptionally balanced on the wrist, offering a solid, reassuring heft that speaks to its all-metal construction and refined finishing. The solid 316L stainless steel case architecture combines vertical hairline satin brushing across the upper lug surfaces with mirror-polished flanks and beveled contours. Dial protection is provided by a heavy-duty, impact-resistant flat mineral crystal glass. \u003cspan class=\"citation-2276 citation-end-2276\"\u003eThe reverse side features an exhibition see-through screw-down caseback that allows the wearer to view the mechanical movement, decorated oscillating rotor, and jewel pivots from behind.\u003csup class=\"superscript\" data-turn-source-index=\"10\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-2275\"\u003eBuilt for dependable daily active resilience, the solid stainless steel case features an ergonomic fluted push-pull crown at 3 o'clock, securing a certified \u003c\/span\u003e\u003cspan class=\"citation-2275\"\u003e10-bar (100 meters \/ 330 ft) water resistance rating\u003c\/span\u003e\u003cspan class=\"citation-2275 citation-end-2275\"\u003e, making it completely safe for swimming, snorkeling, water sports, and daily active wear.\u003csup class=\"superscript\" data-turn-source-index=\"11\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-2274 citation-end-2274\"\u003eThe timepiece comes completed on an integrated solid stainless steel multi-link construction featuring alternating satin-brushed and polished links, secured by a sturdy fold-over deployment clasp with dual push-button safety release.\u003csup class=\"superscript\" data-turn-source-index=\"12\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"MonaWatch","offers":[{"title":"Default Title","offer_id":67745606107450,"sku":"NH9150-52A","price":920.0,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/5858\/3354\/files\/NewProject_8959ea26-a310-4b89-acc4-a976ef38fa7f.webp?v=1792529866","url":"https:\/\/www.monawatch.com\/products\/citizen-collection-open-heart-nh9150-52a-mens-watch","provider":"MonaWatch","version":"1.0","type":"link"}