Watches
Description
Omega Speedmaster Professional Moonwatch — Ref. 3870.50 (3570.50 on Strap)
Rare “Lucky 7s” Repeating Serial: 77779477 | Fully Serviced September 2026
Up for sale is an authentic Omega Speedmaster Professional Moonwatch, Reference 3870.50 — the factory leather-strap designation for the iconic 3570.50. This particular piece carries a standout collector serial number, four consecutive repeating sevens, stamped cleanly on the rear lug.
The watch has just undergone a comprehensive mechanical overhaul in September 2026 by an Omega-Certified Master Watchmaker — completely disassembled, cleaned, lubricated, regulated, and pressure tested.
Product Details:
- Brand & Model: Omega Speedmaster Professional Moonwatch
- Reference: 3870.50 (factory strap designation for 3570.50 / Case Ref 145.0022 / 145.022)
- Serial: 77,779,477 (circa 2001–2005)
- Box & Papers: No original Omega box or warranty card included
- Case & Dial:
- Material: Stainless steel
- Diameter: 42mm (excluding crown), 20mm lug width
- Caseback: Solid flight-qualified Moonwatch medallion, “First Watch Worn on the Moon” engraving
- Bezel: Fixed stainless steel, original black tachymètre insert
- Crystal: Genuine Hesalite, stamped Omega logo centered
- Dial: Original matte black chronograph dial, crisp white indices and luminous markers
- Strap: Brand-new brown rally-style perforated leather with stainless steel buckle
- Movement & Features:
- Caliber: Omega Calibre 1861 manual-wind chronograph (18 jewels, rhodium-plated finish)
- Functions: Running small seconds, 30-minute recorder, 12-hour recorder
- Service History:
- September 8, 2026: Complete teardown, cleaning, lubrication, new genuine gaskets, regulation, Witschi Proof Master pressure testing
- Timing results: +5 sec/day, 290°–311° amplitude, 0.2 ms beat error
Condition & Warranty:
Movement running within COSC-grade specifications with strong amplitude; chronograph operates with crisp mechanical clicks and resets dead-on to zero; passed dry/wet pressure testing. Case and bezel in excellent pre-owned condition — sharp lug chamfers, clean brushed flanks, clear caseback engraving; tachymètre insert dark and legible with only faint, honest handling marks. Crystal clean Hesalite, polished and clear. Strap brand-new and unworn. Covered by a 1-year TamboWatches mechanical warranty.
Why Buy This Watch?
- Turn-Key & Fully Serviced: Fresh September 2026 overhaul, running strong within COSC tolerances, verified Witschi pressure testing, backed by a 1-year TamboWatches mechanical warranty
- Collector “Lucky 7s” Serial: Quad-repeating serial prefix (77779477) — rarely found on standard production runs
- The Authentic 3870.50 Reference: Factory strap designation sharing the exact case, Calibre 1861 movement, dial, and hands as the 3570.50
- Honest, Original Condition: Sharp lyre lug facets, clean factory finishes, zero over-polishing
