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Mid-tier supplier movement · caliber Hamilton Cal. H-50: ETA 2801-2 base, manual-wind, 21,600bph, 80h PR, 17j; used in Khaki Field Mechanical; Hamilton-modified for increased power reserve · 80h power reserve (3.3 days)

Also uses Hamilton Cal. H-50

Hamilton Khaki Field Mechanical 38mm Ref. H69439931, black dial, steel case
Hamilton
Khaki Field
Hamilton Khaki Field Mechanical 42mm Ref. H69819530, black dial, steel case
Hamilton
Khaki Field
Small case: suits slender wrists (under 6.5 in / 16.5 cm)
36 mm case. A compact, elegant wear. Particularly at home on narrower wrists where larger cases can overhang.

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Authentication

The hesalite crystal is correct for this reference; a scratch-free but hazed crystal has been polished and the original surface is gone.

Known issues in the market
  • Hesalite polishing removes the original surface; a polished-clear hesalite looks better but is no longer the original crystal.
  • Manual-wind Cal. H-50 requires regular winding; verify the crown winds smoothly without slipping.
  • Large Arabic numerals are specific to this reference; incorrect numeral styles indicate a dial swap.
AreaWhat to checkWhat is correctRed flag
crystalHesalite crystal conditionMinor surface scratches consistent with age are normal and expected; unpolished surface retains original optical qualityCrystal that is scratch-free but slightly hazy indicating polishing that removed the original surface
crownManual-wind crown functionCrown winds smoothly with uniform resistance through full rotation; no slipping or skippingCrown that slips under winding pressure or skips indicating a worn winding mechanism
dialLarge Arabic numeral styleBold Arabic numerals at all hour positions as specified for the Pilot Pioneer; correct font and sizeIndex markers or baton hands substituted for the Arabic numeral dial indicating a dial swap
Common legitimate replacements
  • Hesalite crystals are inexpensive to replace; a replacement hesalite is acceptable if the reason for replacement is disclosed.
  • Cal. H-50 ETA 2801-2 base service is inexpensive and widely available from independent watchmakers.
Expert resources: Hamilton Khaki Pilot Pioneer documentation at hamiltonwatch.com. WatchUSeek Hamilton subforum for hesalite condition assessment and Cal. H-50 service records.

Authentication guide

Last reviewed June 2026

Hamilton Khaki Pilot Pioneer Mechanical (ref. H76419931), Cal. H-50 on an ETA 2801-2 base, manual-wind. 36mm case; 80-hour power reserve; aviation-influenced Arabic dial. Smaller sibling to the Khaki Field Mechanical 38mm.

Known reproduction risks

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LOW

At the 36mm size and sub-$600 price point, full reproductions are not economically motivated. Misrepresentation between 36mm Pioneer and 38mm Mechanical is the most likely confusion.

  • Case size 38mm on a claimed Pioneer (Pioneer is 36mm)
  • No small seconds at 6 (Pioneer always has subsidiary seconds)
  • Automatic crown that does not require manual winding

Dial variants by era

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EraDescriptionIdentifiers
2016 to presentOngoing production. Matte black dial with Arabic numerals. Small seconds at 6. No date. 36mm case.
  • 36mm case diameter
  • Matte black dial; no date window
  • Small seconds at 6 o'clock
  • Arabic numeral indices
  • Manual-wind crown at 3

Service part flags

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Case Size

Original: 36mm diameter; lug to lug 42mm.

Replacement tells
  • Case measuring at 38mm indicates the larger Khaki Field Mechanical, not the Pioneer
  • Different lug-to-lug distance from 42mm specification
Small Seconds Subdial

Original: Subsidiary seconds at 6 o'clock. H-50 base (ETA 2801-2) includes this complication.

Replacement tells
  • No seconds subdial; ETA 2801 always shows subsidiary seconds at 6
  • Seconds at a position other than 6 indicates wrong movement

Case back markings

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2016 to present
  • Hamilton shield medallion
  • "KHAKI PILOT PIONEER" on caseback
  • Reference H76419931 and serial
  • "SWISS MADE"
  • "100 M / 330 FT"

Movement tells

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  • Cal. H-50 on ETA 2801-2 base. 21,600 bph (6 ticks per second). Manual-wind. 80-hour power reserve.
  • The 21,600 bph rate is slower than the 28,800 bph automatic. Listening to the tick: the Pioneer should be clearly slower-ticking than the Khaki Field Auto.
  • No hacking (seconds do not stop when crown is pulled on the H-50). This is a feature, not a defect.
Sources: Hamilton official — Khaki Aviation.

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