Jerome P. 30/04/2026
| Reference Ocarat | #110365 |
| Reference | NH9131-73A |
| Brand | Citizen |
| Product Type | Watch |
| Gender | Men |
| Color | Gray White |
| Material | Steel |
| Material Quality | Stainless Steel |
| Finish | Polished / Shiny |
| Warranty | 2 Years |
| Thickness (in mm) | 10,70 |
| Diameter (in mm) | 40,00 |
| Manufacturing | Japan |
| Warranty Type | International |
| Labels and Certificates | Authorized Retailer |
| Case Shape | Round |
| Case Weight (in g) | 125,00 |
| Dial Finish | Guilloché Open heart |
| Watch Case Back | Exhibition Case Back Screwed caseback |
| Crystal Shape | Flat |
| Glass Quality | Mineral Crystal |
| Buttons | 1 Crown |
| Water Resistance (in ATM) | 5 |
| Frequency | 21,600 A/h (3 Hz) |
| Movements | Automatic (rotor) |
| Movement Type | Japanese Movement |
| Movement Brand | Miyota |
| Calibers (Movements) | Miyota 8229A |
| Calendar and Time | Hours Minutes Seconds |
| Power Reserve (Maximum Duration) | 40 hours |
| Display Type | Analog (hands) |
| Display Specifications | Arabic Numerals Indices and railroad track |
| Bracelet Material | Stainless Steel |
| Strap Color | Black |
| Bracelet Material Finish | Brushed steel Polished steel |
| Topstitching | Yes |
| Water Resistant | Yes |
| Watch Clasp | Deployment Clasp |
| Lug Width (in mm) | Special - Custom Made |
The iconic Japanese brand Citizen began its journey specializing in calculators and chronometers, delivering precision tools of real value. Over time, its innovative timepieces won over both women and men with their beautiful designs and impressive performance. Celebrated worldwide for the quality of their materials - combining exceptional durability with unrivaled precision - Citizen's watches are truly in a class of their own. The NH9131-73A watch from the Platform Mechanical Open Heart collection is a perfect expression of the brand's commitment to detail. Its round stainless steel case, resistant to wear and corrosion, displays an elegant grey tone enhanced by a polished finish. With a diameter of 40 mm, a thickness of 10.70 mm, and a weight of 128 g, it sits gracefully on the wrist. A flat mineral crystal showcases the dial details, adjustable via the grey knurled crown positioned at 2 o'clock. Committed to an unmatched visual experience, the brand equipped this watch with a screw-down transparent case back, revealing the movement's inner beauty. This design also gives the watch a water resistance of 5 ATM, keeping you worry-free throughout your daily activities.
This clean yet elegant dial instantly draws the eye with its refined design. Its guilloché white dial creates a captivating sense of depth. The edge is framed by a minute track of dashes and dots that adds a subtle dynamic to timekeeping and a touch of sophistication to the whole. Triangular grey hour markers stand out elegantly on the dial, while an Arabic numeral replaces the 12 o'clock index - a modern twist on this classic backdrop. The dauphine hands and seconds hand in blue glide gracefully to indicate hours, minutes, and seconds, adding a distinctive flair to every movement. At 6 o'clock, a circular open heart reveals the intricate inner workings of the caliber, inviting you to admire the beauty of fine watchmaking. At 12 o'clock, the brand name followed by the movement type rounds out the dial - a testament to the excellence and craftsmanship that define this exceptional watch.
The heart of this watch beats to the rhythm of an automatic movement - specifically the reliable and precise Japanese Miyota 8229A caliber. With an impressive power reserve of over 40 hours, it features 21 jewels to minimize friction. Operating at a frequency of 21,600 vph, it delivers exceptional timekeeping accuracy at every moment.
This bracelet is a true jewelry piece that will complete your look with elegance and refinement. Thoughtfully crafted, it features a beautiful silver tone that pairs perfectly with any outfit. Made from stainless steel, it benefits from polished and brushed finishes for a remarkable look every time you wear it. Durable and lightweight, it keeps up with all your activities without ever getting in the way. Its deployment clasp makes it easy to wear and remove with effortless ease.
With a water resistance of 5 atmospheres, equivalent to 50 meters, this watch is your entry point into the world of water resistance. While it's not designed for bathing, lap swimming, or scuba diving, you can safely forget to take it off in the shower. That said, our team of experts recommends keeping this timepiece dry to preserve its movement for years to come.



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Customer reviews
Jerome P. 30/04/2026
Pascal A. 25/05/2025
Platform NH9131-73A Watch
(Ref. 110365)