There are dress watches, and then there is the A. Lange & Söhne Saxonia Thin. To wear one is to understand precisely what watchmaking looks like when every unnecessary element has been removed and what remains has been executed without compromise. Reference 205.086 — known informally as the Copper Blue — pushes that philosophy to its most extraordinary visual expression: a 39mm white gold case housing one of the most singular dials in Lange's entire portfolio.

The aventurine glass dial is the defining element of this reference. Aventurine is a form of glass manufactured with copper crystals suspended throughout its body during production — a process that cannot be replicated through printing, lacquering, or any other surface treatment. The result is a dial that is simultaneously a mineral, a gemstone, and an optical phenomenon. Under different light conditions it shifts from an intense midnight blue to a living scatter of copper-gold sparks as the crystals catch and reflect independently. Every example is unique — the distribution of crystals within each dial is entirely random, and no two Copper Blue Saxonia Thins display identically.

The white gold case measures 39mm in diameter and just 6.2mm in thickness — a genuine achievement for an in-house manually wound movement. The total watch height is 6.5mm and 45.1mm lug-to-lug, which means the Saxonia Thin vanishes beneath a shirt cuff with complete grace. The manual calibre within delivers a 72-hour power reserve, requiring a deliberate winding ritual that forges a daily connection between wearer and watch that no automatic movement can replicate. The black alligator leather strap with pin buckle completes the watch exactly as Lange intended — restrained, precise, and perfectly coordinated with white gold and deep blue.

Why This Watch Stands Apart
• Aventurine glass Copper Blue dial — suspended copper crystals; no two dials are identical, no process can replicate it
• 18k white gold 39mm case — a precious metal setting for one of Lange's most refined collections
• 6.2mm case thickness — one of the slimmest cases in the Lange catalogue, disappears under any cuff
• Manual winding movement — 72-hour power reserve, hours and minutes only — the purist's Lange
• 45.1mm lug-to-lug — supremely balanced on any wrist size
• Blue alligator leather strap with pin buckle — the correct pairing for a watch of this purity
• 2022 pre-owned, very good condition — complete with original A. Lange & Söhne box and papers

Technical Specifications
• Brand: A. Lange & Söhne
• Model: Saxonia Thin
• Nickname: Copper Blue
• Reference: 205.086
• Year: 2022
• Condition: Pre-Owned – Very Good
• Case Diameter: 39 mm
• Case Thickness: 6.2 mm (case) / 6.5 mm total
• Lug-to-Lug: 45.1 mm
• Case Material: 18k White Gold
• Water Resistance: 3 ATM / 30 metres
• Dial: Blue Aventurine Glass (Copper Blue)
• Functions: Hours, Minutes
• Movement: Manual Winding, In-House Calibre
• Power Reserve: 72 Hours
• Strap: Blue Alligator Leather
• Buckle: Pin Buckle
• Set Includes: Watch, Original Box & Papers