Atrium Swiss Automatic Chronograph Moonphase Ref. 7751-variant
Complications Chronograph with Moonphase · Atrium Swiss (a private label or 'ghost' brand often utilizing high-quality Swiss ebauches for European markets)
Period: Neo-Vintage (Late 1980s - 1990s)
Type
Complications Chronograph with Moonphase
Brand
Atrium Swiss (a private label or 'ghost' brand often utilizing high-quality Swiss ebauches for European markets)
Movement
Automatic, likely Valjoux 7751 or 7750-based modified caliber, 28,800 bph, approximately 42-hour power reserve
Dimensions
38mm diameter, 14mm thick, 45mm lug-to-lug, 18-20mm lug width
Description
This Atrium Swiss chronograph represents the classic era of Valjoux 7751 production. It features a complicated dial layout that combines a 12-hour chronograph with a romantic moonphase complication. The aesthetic is heavily influenced by high-end brands like Blancpain or Breguet from the same era, but offered at a more accessible price point through a boutique Swiss brand. The gold-toned finish and white dial provide a formal, executive look characteristic of 90s luxury.
Key Features
Integrated moonphase at 3 o'clock, red 'ATRUM' text on the dial, and a modified sub-dial layout differing from the standard 7751 (which usually places moonphase at 6).
Dial Description
White lacquer dial with printed Roman numerals, triple sub-dial chronograph layout, moonphase aperture at 3 o'clock, date window at 3, red brand branding, gold-toned leaf hands
Case Material
Gold-plated (PVD or electroplated) over stainless steel or brass, polished finish
Crystal Type
Mineral glass or flat sapphire; appears to have moderate surface reflections suggesting minimal AR coating
Bezel Details
Fixed, stepped polished bezel in matching gold tone
Crown & Pushers
Knurled push-pull crown, two cylindrical pump-style chronograph pushers at 2 and 4 o'clock
Bracelet or Strap
Gold-plated three-link oyster-style bracelet with flat links and a folding friction clasp
Caseback Details
Likely solid screw-down or snap-on caseback with standard branding and water resistance engravings
Movement Type
Automatic, likely Valjoux 7751 or 7750-based modified caliber, 28,800 bph, approximately 42-hour power reserve
Water Resistance
30m (Splash resistant only); not recommended for swimming or bathing.
Origin & Provenance
Swiss Made; likely assembled in the Jura region using outsourced Valjoux movements
Age Estimate
Produced circa 1990-1998
Cultural Significance
Represents the 'Mechanical Revival' period where traditional complications like moonphases were reintroduced to consumer tiers after the Quartz Crisis.
Condition Notes
Good to Fair. Visible plating wear on the bracelet links and lug edges. Dial remains clean with no visible oxidation. Minimal scratches on the crystal.
Value Estimate
$400 - $800 USD based on current market for gold-plated 90s Swiss chronographs.
Care & Maintenance
Standard 5-year movement service; avoid water exposure due to aging gaskets and plating; avoid magnetic fields from electronics.
Similar Watches
Longines Master Collection Moonphase, Omega Speedmaster Day-Date, Breitling Navitimer 1451, various Maurice Lacroix Phase de Lune models.
Interesting Facts
During the late 80s and 90s, many smaller Swiss firms used the Valjoux 7750/7751 movement to create 'luxury-look' watches to compete with the rising dominance of quartz while high-end horology was entering its renaissance.