Renautus Classic Open Heart Custom Automatic
Dress Watch / Open Heart Complication · Renautus (Custom Watch JP); a Japanese microbrand known for bespoke, configurable timepieces.
Period: Modern Minimalist (2010s-Present) with Neo-Classical elements like Roman numerals and a rail-track minute circle.
Type
Dress Watch / Open Heart Complication
Brand
Renautus (Custom Watch JP); a Japanese microbrand known for bespoke, configurable timepieces.
Movement
Automatic, self-winding Seiko/TMI NH38 or Miyota 8 series open-heart caliber; approx. 21,600 vph, 40-hour power reserve.
Dimensions
40mm diameter, 12mm thickness, 48mm lug-to-lug, 20mm lug width; wears true to size for a modern dress watch.
Description
A sophisticated example of Japanese microbrand customization, this Renautus combines a classic Roman numeral aesthetic with the visual intrigue of an 'open heart' window. The use of mother-of-pearl on the dial adds luxury texture rarely seen at this price point, while the gold-tone case provides a formal, dressy presence.
Key Features
Mother-of-pearl dial leaf, open-heart escapement window at 8 o'clock, Renautus 'R' monogram logo, and thin elegant line work.
Dial Description
Champagne/cream mother-of-pearl dial, printed Roman numeral indices, railroad minute track, baton hands, and a circular 'open heart' aperture at 8 o'clock.
Case Material
Stainless steel with a yellow gold-tone PVD or IP plating; fully polished finish.
Crystal Type
Flat sapphire crystal, likely with internal AR coating.
Bezel Details
Fixed, slender polished bezel integrated into the step-case design.
Crown & Pushers
Standard push-pull fluted crown at 3 o'clock, gold-plated to match the case.
Bracelet or Strap
Black smooth calfskin leather strap with matching gold-tone tang buckle.
Caseback Details
Likely an exhibition/display screw-down caseback showing the rotor and balance wheel.
Movement Type
Automatic, self-winding Seiko/TMI NH38 or Miyota 8 series open-heart caliber; approx. 21,600 vph, 40-hour power reserve.
Water Resistance
Rated at 5 ATM (50 meters); suitable for splashes and rain, but not recommended for swimming or bathing.
Origin & Provenance
Japanese design and assembly; movements sourced from Seiko (TMI) or Miyota (Citizen).
Age Estimate
Modern production, circa 2020-2024.
Cultural Significance
Represents the rise of the 'Custom Microbrand' culture in the Japanese domestic market (JDM), emphasizing personalization over mass-market branding.
Condition Notes
Very Good/Excellent; minimal visible wear on the case plating, dial is pristine, strap appears lightly used.
Value Estimate
Market value $200 - $350 USD depending on specific movement and caseback options selected during original build.
Care & Maintenance
Service every 5 years; avoid water due to leather strap and push-pull crown; clean cases with a microfiber cloth to preserve PVD plating.
Similar Watches
Orient Bambino Open Heart (lower price, more traditional), Seiko Presage 'Zen Garden' Open Heart (higher finish, similar movement).
Interesting Facts
Renautus represents a shift in 'affordable luxury' where customers in Japan can choose every component of their watch—from hands to movements—online before assembly.