Citizen Mechanical Open Heart Ref. NH9131-06E
Dress Watch with Open Heart Complication · Citizen Watch Co., an independent Japanese multinational watchmaking conglomerate representing an accessible luxury and reliable everyday tier
Period: Modern Luxury (2000s-present) with classical minimalist dress watch cues
Type
Dress Watch with Open Heart Complication
Brand
Citizen Watch Co., an independent Japanese multinational watchmaking conglomerate representing an accessible luxury and reliable everyday tier
Movement
Japanese automatic self-winding movement, Citizen Caliber 8229, operating at 21,600 vph (3 Hz) with approximately 40 hours of power reserve and 21 jewels
Dimensions
Case diameter approximately 40mm, thickness around 11-12mm, lug-to-lug distance roughly 47mm, and lug width of 20mm
Description
An elegant and sophisticated dress timepiece from Citizen that blends classic formal aesthetics with the mechanical charm of an exposed balance wheel. The deep black dial provides a dramatic backdrop for the warm rose gold accents and indices, while the open-heart display at 6 o'clock offers a captivating glimpse into the beating mechanical heart within. Versatile enough for the boardroom yet striking enough for evening wear.
Key Features
Open-heart aperture at 6 o'clock showcasing the balance wheel, striking combination of a black dial with rose gold-toned hardware, clean minimal bezel design, and reliable Japanese automatic movement
Dial Description
Matte black dial featuring rose gold/copper-toned applied dauphine/arrow indices, a prominent Arabic numeral '12' at the top, elegant dauphine hands, and an open-heart aperture at the 6 o'clock position revealing the oscillating balance wheel
Case Material
Stainless steel with a high-polish finish
Crystal Type
Sapphire crystal or hardened mineral crystal, flat profile
Bezel Details
Fixed smooth polished stainless steel bezel
Crown & Pushers
Push-pull stainless steel crown located at the 3 o'clock position, subtly knurled for grip
Bracelet or Strap
Black leather strap with alligator embossing, tonal stitching, and a stainless steel pin buckle or deployant clasp
Caseback Details
Exhibition display case back with a mineral glass window allowing a view of the mechanical movement
Movement Type
Japanese automatic self-winding movement, Citizen Caliber 8229, operating at 21,600 vph (3 Hz) with approximately 40 hours of power reserve and 21 jewels
Water Resistance
Rated to 50 meters (5 ATM / 165 feet), suitable for accidental splashes, rain, and light hand washing, but not recommended for swimming or diving
Origin & Provenance
Made in Japan, featuring an in-house Citizen automatic mechanical movement
Age Estimate
Modern production, likely circa 2018-2023
Cultural Significance
Represents the increasing accessibility of mechanical watchmaking complications, specifically the open-heart design popularized in the modern era to appeal to enthusiasts who appreciate visible horology without the cost of a full skeleton
Condition Notes
The watch appears in very good to excellent wearable condition with a clean polished case, unblemished crystal, and well-maintained leather strap
Value Estimate
Estimated secondary or retail market value range between $250 and $450 USD depending on region and exact variant
Care & Maintenance
Recommended mechanical service interval every 4 to 5 years, avoid exposure to strong magnetic fields, clean the leather strap periodically with specialized leather conditioner, and keep away from moisture as this is primarily a dress watch
Similar Watches
Seiko Presage Cocktail Time Open Heart, Orient Bambino Open Heart, Tissot Powermatic 80 Open Heart
Interesting Facts
Citizen is one of the few vertically integrated watchmakers in the world, producing everything from eco-drive quartz to robust mechanical calibers completely in-house