Casio Lineage Titanium LIN-165 (specifically LIN-165-1B)
Everyday Tool/Dress Watch · Casio Computer Co., Ltd. Within the 'Lineage' sub-brand, which focuses on full-metal (usually titanium or steel) analog watches for the domestic and international markets.
Period: Late 1990s to Early 2000s JDM Style. It features the 'Bio-design' aesthetic typical of that era, characterized by smooth, flowing integrated lines and ergonomic shapes.

Type
Everyday Tool/Dress Watch
Brand
Casio Computer Co., Ltd. Within the 'Lineage' sub-brand, which focuses on full-metal (usually titanium or steel) analog watches for the domestic and international markets.
Movement
Quartz movement, Casio Module 2719. Features standard timekeeping (hours, minutes, seconds) with approximately 2-3 years of battery life and +/- 20 seconds per month accuracy.
Dimensions
Case diameter: 36-38mm; Thickness: 8-9mm; Lug-to-lug: 42mm; Integrated bracelet width: 18mm at the narrowest point. It wears very light and slim due to the titanium build.
Description
The Casio Lineage series was designed to provide a lightweight, premium-feeling metal watch for everyday wear without the bulk of a G-Shock. This LIN-165 model is prized for its monochromatic gray aesthetic and incredible lightness. It represents the era when titanium became an affordable alternative to steel in mass-market horology.
Key Features
Full titanium construction (case and bracelet), integrated lug design, and the specific 'Lineage' branding which signifies Casio's more 'mature' non-digital design language.
Dial Description
Matte charcoal/black dial with sunburst effect. Features a prominent Arabic '12' at the top, applied silver baton indices for other hours, and simple stick hands. Text includes 'CASIO LINEAGE', 'TITANIUM', and 'WR 50M'.
Case Material
Solid Titanium with a matte sandblasted/beaded finish. Titanium provides a high strength-to-weight ratio and is hypoallergenic.
Crystal Type
Flat Mineral Glass. The image shows some superficial surface scratching and slight clouding consistent with age.
Bezel Details
Fixed, integrated smooth bezel made of titanium, matching the case finish. No markings; designed for a streamlined, minimalist look.
Crown & Pushers
Small, textured push-pull crown at the 3 o'clock position. No crown guards, though the case transitions smoothly toward the crown.
Bracelet or Strap
Integrated Titanium bracelet with three-link 'Oyster-style' design. Features a folding clasp with a safety release or a simple press-button deployant.
Caseback Details
Screw-down solid stainless steel or titanium caseback. Likely engraved with the Casio logo, '2719' module number, 'LIN-165', and 'Titanium'.
Movement Type
Quartz movement, Casio Module 2719. Features standard timekeeping (hours, minutes, seconds) with approximately 2-3 years of battery life and +/- 20 seconds per month accuracy.
Water Resistance
50 Meters (5 ATM). Suitable for light swimming and splashing, but not recommended for diving or high-pressure water sports. Seal integrity should be verified due to age.
Origin & Provenance
Japanese Movement (Cased in China or Thailand). Casio is a Japanese giant in the affordable and mid-range electronic watch tier.
Age Estimate
Circa 1998–2005. The 'TITANIUM' branding and dial font are quintessential for Casio's turn-of-the-century catalogs.
Cultural Significance
Represents the 'Everyman's' reliable watch of the late 90s. While not a high-luxury piece, it symbolizes the democratization of advanced materials like titanium in consumer electronics.
Condition Notes
Fair to Good. Visible scratches on the mineral crystal and high-wear areas of the titanium bezel. Titanium tends to show 'snail trails' or surface scuffs easily, which are present here. Original bracelet appears intact.
Value Estimate
$40–$85 USD. Factors include the integrated bracelet (if sized too small for the buyer, links are hard to find) and the condition of the crystal. It is a 'hidden gem' for budget collectors.
Care & Maintenance
Requires battery changes every ~2 years. Gaskets should be checked if used near water. Titanium can be cleaned with mild soap and a soft brush; avoid harsh abrasives which will ruin the bead-blasted finish.
Similar Watches
Seiko Titanium Spirit models, Citizen Eco-Drive Titanium (Super Titanium), and various Tissot PR100 Titanium versions. This Casio is thinner and more minimalist than most G-Shocks of the same era.
Interesting Facts
The Lineage line was one of the first mass-produced series to offer full titanium construction at an entry-level price point. Today, the Lineage line still exists but has evolved into solar-powered, radio-controlled atomic watches.