Omega Seamaster 120m Ref. 2511.31 or similar quartz model
Dive Watch (Sports/Skin Diver Subcategory) · Omega (Swatch Group), Luxury tier
Period: Quartz Revolution Era (1990s)
Type
Dive Watch (Sports/Skin Diver Subcategory)
Brand
Omega (Swatch Group), Luxury tier
Movement
Omega Caliber 1538 high-precision quartz movement with end-of-life indicator, 6 jewels
Dimensions
Case diameter 36 mm, case thickness 10 mm, lug-to-lug distance 43 mm, lug width 18 mm
Description
The Omega Seamaster 120m represents a refined, understated approach to the legendary Seamaster line. Unlike its chunkier professional sibling the Seamaster 300m, this mid-size sports watch bridges the gap between a robust tool watch and an elegant everyday dress timepiece. Featuring a clean matte dial, classic sword hands, and a balanced 36mm stainless steel case with integrated crown guards, it offers exceptional versatility, comfort, and timeless vintage-inspired charm.
Key Features
Mid-size 36mm case proportions, fixed smooth bezel distinguishing it from rotating diver bezels, Seamaster 120m depth rating, robust quartz movement with quick-set hour hand capability, and classic 90s Omega design language
Dial Description
Matte black dial featuring applied luminous hour markers, baton and double baton at 12, sword hands, date window at 3 o'clock, and inner minute track with Arabic numerals for every 5 minutes
Case Material
Stainless steel 316L with a combination of brushed top surfaces and polished bevels
Crystal Type
Flat sapphire crystal with anti-reflective coating on the inside
Bezel Details
Fixed smooth polished stainless steel bezel
Crown & Pushers
Signed screw-down crown with crown guards integrated into the right side of the case
Bracelet or Strap
Black leather strap with tonal stitching and a steel pin buckle
Caseback Details
Solid screw-down case back featuring the embossed Omega Seamaster Hippocampus logo
Movement Type
Omega Caliber 1538 high-precision quartz movement with end-of-life indicator, 6 jewels
Water Resistance
Rated to 120 meters (400 feet / 12 ATM), suitable for swimming, snorkeling, and recreational water sports, but not professional scuba diving.
Origin & Provenance
Swiss Made, manufactured in Bienne, Switzerland, Swiss quartz movement
Age Estimate
Circa 1990s to early 2000s
Cultural Significance
Representing Omega's transition through the quartz crisis into the modern era, this model maintained the brand's nautical heritage while offering accessible luxury to a broader audience during the 1990s watch boom.
Condition Notes
Very good overall condition. Case shows minor hairline scratches consistent with light wear but retains crisp factory lines and polished bevels. Crystal is clean without visible scratches. Dial and hands are pristine with intact luminous material.
Value Estimate
Estimated secondary market value ranges from $800 to $1,500 USD depending on the presence of original box and papers, overall condition, and service history.
Care & Maintenance
Battery replacement every 2 to 3 years by a watchmaker to ensure fresh seals are installed. Professional water resistance pressure testing is recommended after every battery change. Avoid exposure to strong magnetic fields despite quartz shielding.
Similar Watches
Omega Seamaster Professional 300m quartz (adds rotating bezel and helium escape valve), Rolex Datejust 36 (more formal dress aesthetic), Tag Heuer 2000 Series quartz
Interesting Facts
The Seamaster 120m line was popularized in various iterations throughout the latter half of the 20th century. The quartz versions from the 1990s offered supreme reliability and accuracy, making them popular daily wearers for professionals who wanted luxury branding paired with robust everyday utility.