HAMILTON Khaki Aviation Pilot Auto Chrono H646660 27Jewels Automatic.

HAMILTON Khaki Aviation Pilot Auto Chrono H646660 27Jewels Automatic.

Welcome to my auction!
I am Japanese who live in Tokyo.

Item description

Movement :

• Pet name : Khaki Aviation Pilot Auto Chrono .
• Caliber number : H31.
• Movement : Automatic.
• Beat rate : 28800bph.

Externals :

• Dial number : SWISS MADE.
• Glass : Sapphire Crystal.
• Case size : About 44mm.
• Lug width : 20mm.
• Band : Used Leather Strap of HAMILTON original.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set of the date : Switch the date using the date change button located at the 10 o'clock position on the side of the case.
• The day difference time of an used watch is about +-1 minute / day.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

The Sovereign Peak of Modern Flieger Aviation Architecture: Sourced under reference **H646660**, the **Hamilton Khaki Aviation Pilot Auto Chrono** represents the modern zenith of classic WWII-inspired *Beobachtungs-Uhren* (B-Uhr) pilot instrumentation. Engineered specifically for high-contrast legibility, this 44mm tool watch bridges vintage military navigation aesthetics with high-grade contemporary Swiss chronometric manufacturing.

The Over-Engineered 27-Jewel Caliber H-31 Automatic Movement: Powering this aviation instrument is the high-performance **27-jewel Caliber H-31**, an automatic chronograph movement built upon the legendary Valjoux 7753 base. Upgraded with an extended **60-hour power reserve**, an optimized escapement, and an extraordinary **27-jewel specification** across critical gear-train and chronograph pivots, this engine operates at **28,800 vibrations per hour (4 Hz)** with smooth integrated pusher actuation.

Architectural 44mm Stainless Steel Case & Dual-Pusher Integration: Built in a robust solid stainless steel case, the reference **H646660** features bold brushed surfaces offset by razor-sharp polished chamfers and strong, sweeping lug contours. Designed for extreme utility, it incorporates a oversized tactile crown with integrated crown guards, dual chronograph pushers, a quick-set date pusher, and **200-meter (20 bar) water resistance** topped with an anti-reflective sapphire crystal.

B-Uhr Type B Dial Layout and High-Contrast Cockpit Clarity: The dial of the **H646660** exhibits an iconic Type B pilot layout, prioritizing outer minute/second numerals from 5 to 55 alongside an inner 12-hour ring. Fitted with skeletonized syringe-style flight hands filled with Super-LumiNova, the dial features twin sub-dials at 3 and 9 o'clock for chronograph counting, complemented by a discreetly framed date window at 6 o'clock.

An Essential Cornerstone of Modern Aviation Chronographs: Blending vintage military heritage with high-grade Swiss chronograph engineering, the 27-jewel Hamilton Khaki Aviation Pilot Auto Chrono H646660 stands as a formidable, highly respected modern classic. It represents an essential anchor for collectors seeking pure aviation utility combined with robust automatic mechanical power.

For more information, please look at the pictures.

Notes

• Before buying.
  The vintage watches we sell are inspected and adjusted so they work fine. However, since it is an vintage watch, Please purchase on the assumption that it will be repaired.
  
  
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