Khaki Aviation Pilot Day Date Auto 42mm
Ref. H64635140
- Case diameter
- 42 mm
- Manufacturer spec
- Lug-to-lug
- 51 mm
- Measured in a published review
- Thickness
- 12.1 mm
- Manufacturer spec
- Lug width
- 20 mm
- Manufacturer spec
Retail price $1,125 (US, Oct 2026)
How the Khaki Aviation Pilot Day Date Auto 42mm wears
Its lugs reach 9 mm past the 42 mm case, more than the 7.1 mm typical across the almanac, so it wears larger than its diameter suggests.
On our fit model it sits best on wrists from 7" to 8.5" (17.8–21.6 cm); below 7" the lugs start to reach the edge of the wrist.
At 12.1 mm thick it is slimmer than 57% of the 14 other pilot watches we've measured, so it slides under a cuff more easily than most.
Its 20 mm lug width is one of the most common strap sizes; 104 other watches here share it, so aftermarket straps are easy to find.
Will the Khaki Aviation Pilot Day Date Auto 42mm fit your wrist?
With a 51 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.
| Wrist | Flat width (est.) | Fit |
|---|---|---|
| 6" | 47.2 mm | Lugs overhang |
| 6.5" | 51.2 mm | Lugs overhang |
| 7" | 55.1 mm | Ideal fit |
| 7.5" | 59.1 mm | Ideal fit |
| 8" | 63 mm | Ideal fit |
Specifications
- Reference
- H64635140
- Collection
- Khaki Aviation
- Status
- In production
- Introduced
- 2024
- Case material
- stainless steel
- Crystal
- sapphire
- Water resistance
- 100 m
- Bezel
- fixed
- Dial
- blue
- Strap / bracelet
- stainless steel bracelet, folding clasp
- Style
- Pilot, Everyday
Movement
- Caliber
- ETA (Hamilton) H-30
- Type
- automatic
- Power reserve
- 80 hours
- Jewels
- 25
Takes 20 mm straps. See other 20 mm watches and straps.
More Khaki Aviation references
Watches that wear the same size
Other watches within 1.5 mm of its lug-to-lug.
- OrisAquis Date 43.501 733 7789 4135-07 8 23 04PEB
- Case
- 43.5 mm
- Lug-to-lug
- 51 mm
- Thick
- 13.1 mm
- RolexSea-Dweller126600
- Case
- 43 mm
- Lug-to-lug
- 51 mm
- Thick
- 15 mm
- TissotPRX Powermatic 80 40mmT137.407.11.041.00 · “PRX”
- Case
- 40 mm
- Lug-to-lug
- 51 mm
- Thick
- 10.9 mm
- ZodiacSuper Sea Wolf CeramicZO9592
- Case
- 41 mm
- Lug-to-lug
- 51 mm
- Thick
- 13.2 mm
- LonginesHydroConquest 41mmL3.781.4.56.6
- Case
- 41 mm
- Lug-to-lug
- 51.1 mm
- Thick
- 11.9 mm
- CertinaDS Action Diver 43mm Powermatic 80C032.607.11.051.00
- Case
- 43 mm
- Lug-to-lug
- 51.4 mm
- Thick
- 13.1 mm
Same 20 mm lug width
All 20 mm watchesThese take the same straps as the Khaki Aviation Pilot Day Date Auto 42mm.
- BalticAquascaphe Classic
- Case
- 39 mm
- Lug-to-lug
- 47 mm
- Thick
- 13 mm
- BalticAquascaphe GMT MK II
- Case
- 39.5 mm
- Lug-to-lug
- 47 mm
- Thick
- 13.8 mm
- BalticAquascaphe MK2 37mm
- Case
- 37 mm
- Lug-to-lug
- 45 mm
- Thick
- 12.9 mm
- BalticAquascaphe MK2 39.5mm
- Case
- 39.5 mm
- Lug-to-lug
- 47 mm
- Thick
- 12.9 mm
- BalticBicompax 002
- Case
- 38 mm
- Lug-to-lug
- 47 mm
- Thick
- 13 mm
- BalticHMS 002
- Case
- 38 mm
- Lug-to-lug
- 47 mm
- Thick
- 13 mm