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The green and blue Hamilton Khaki Field Auto 38mm share the same core specifications; the main differences are dial color and which strap or bracelet configuration you choose. The blue leather-strap version is reference H70455540, while the green bracelet version is H70455160. Fratello also lists the green-on-leather H70455560 and blue-on-bracelet H70455140.
What differs between the green and blue versions?
Hamilton’s captured product pages document the blue dial on a leather strap and the green dial on a steel bracelet. Fratello’s June 7, 2025 article lists both colors with either attachment, making clear that color and configuration are separate choices—not a fixed green-equals-bracelet, blue-equals-leather pairing.
| Dial and configuration | Reference | Strap or bracelet reference | Source coverage |
|---|---|---|---|
| Blue, leather strap | H70455540 | H6007041041 | Hamilton US product page [Hamilton] |
| Green, steel bracelet | H70455160 | H6057041041 | Hamilton international product page [Hamilton] |
| Green, leather strap | H70455560 | Not stated in Fratello’s article | Fratello, June 7, 2025 [Fratello] |
| Blue, steel bracelet | H70455140 | Not stated in Fratello’s article | Fratello, June 7, 2025 [Fratello] |
The Hamilton pages list a 20mm lug width, but that measurement alone does not confirm compatibility with every third-party strap. For a replacement, check the precise fitting and end-link or spring-bar requirements before ordering.
How do the dials look?
Hamilton identifies the colors simply as green and blue. Fratello’s Thomas Van Straaten describes both dials as having sunburst finishing and concentric graining, which gives them more visual movement than a flat, subdued field-watch dial. That is a visual impression, not a color measurement or a claim of historical military accuracy.
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Green
Van Straaten found the green warm and yellow-leaning. In his view, the textured finish makes it more expressive than a plain military-style dial; whether that is an advantage depends on whether you prefer a restrained or more noticeable field watch.
Blue
Van Straaten wrote: “The blue is difficult to pin down, shifting between denim blue and even slightly purple in certain lighting.” Treat that as his subjective observation: the dial’s appearance varies with the light and is not a fixed color specification.
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Are the specifications otherwise the same?
Hamilton lists the same headline dimensions and performance specifications for the two directly documented configurations. Fratello’s hands-on article provides additional movement details.
| Specification | Hamilton blue H70455540 | Hamilton green H70455160 |
|---|---|---|
| Case diameter | 38mm [Hamilton US] | 38mm [Hamilton international] |
| Thickness | 11mm [Hamilton US] | 11mm [Hamilton international] |
| Lug-to-lug | 47mm [Hamilton US] | 47mm [Hamilton international] |
| Lug width | 20mm [Hamilton US] | 20mm [Hamilton international] |
| Movement | H-10 automatic [Hamilton US] | H-10 automatic [Hamilton international] |
| Power reserve | 80 hours, manufacturer specification [Hamilton US] | 80 hours, manufacturer specification [Hamilton international] |
| Crystal | Sapphire [Hamilton US] | Sapphire [Hamilton international] |
| Water resistance | 100m [Hamilton US] | 100m [Hamilton international] |
| Case back and balance spring | Open case back; Nivachron balance spring [Hamilton US] | Open case back; Nivachron balance spring [Hamilton international] |
Hamilton’s pages specify 11mm thickness, while Fratello gives 11.5mm in its June 2025 article. The sources therefore disagree on this dimension; the 11.5mm figure should not be silently substituted for Hamilton’s published specification. Fratello also lists manual winding and hacking, 21,600 vibrations per hour, 25 jewels, and time, date, and seconds functions. Hamilton describes the H-10 as a caliber family that can come with or without a date; Fratello’s model-level specification lists a date for this watch.
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The 80-hour reserve is Hamilton’s stated specification, not an independent measurement. Fratello notes that Hamilton also offers a 42mm size, but that is a separate size choice rather than one of these 38mm color variants.
What do the listed prices tell you?
Prices are tied to region, configuration, and the date they were recorded, so these figures are not a universal like-for-like comparison:
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- Blue leather, H70455540: Hamilton’s US page displayed $795 when captured; the page’s stock status and price can change. [Hamilton US]
- Green bracelet, H70455160: Hamilton’s international page displayed a recommended retail price of CHF 730 including VAT when captured. [Hamilton international]
- Prices reported in June 2025: Fratello listed CHF 650 for the strap version and CHF 730 for the bracelet version. Those are dated Swiss-franc figures, not confirmation of today’s prices in other markets. [Fratello]
Hamilton’s blue product page states a two-year international warranty. Confirm current regional price, availability, and warranty terms with the seller or Hamilton before purchase.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which one should you choose?
- Choose blue on leather if you want the documented blue configuration and prefer a strap over steel. Its changing appearance—from denim-like to slightly purple in Van Straaten’s account—makes it the less predictable dial color.
- Choose green on bracelet if you want the documented bracelet configuration and a warmer, more yellow-leaning dial impression.
- Look up the other two references if you want blue on bracelet or green on leather. Fratello lists those combinations, but the captured Hamilton pages do not establish their current regional availability.
Since the case and principal specifications are shared, the practical decision is mostly about which color and wrist attachment you want—not a different movement or water-resistance rating.
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