Hamilton Khaki Field H70455733

The Hamilton Khaki Field Auto 38mm (reference H70455733) is a Swiss-made automatic field watch with a black dial, stainless steel case, and cow leather strap. It is powered by Hamilton's Calibre H-10 automatic movement, Hamilton's version of the Swatch Group Powermatic 80 architecture, and is a distinct model from the hand-wound Khaki Field Mechanical line, which shares the same 38mm case size designation but uses a different movement, a thinner case, and a lower water resistance rating.

Hamilton became a military contractor for the US Armed Forces in 1914, supplying wristwatches described as "trench watches" during World War I as the industry shifted away from pocket watches. In 1942 Hamilton stopped civilian production entirely and became, according to a company history piece, the official watchmaker for the US military, producing over one million timepieces and precision instruments during the war and receiving an Army-Navy E Award for Excellence in War Production.

After World War II, Hamilton continued supplying watches for the Korean and Vietnam Wars, a relationship that shaped the design language later applied to the civilian Khaki Field line: large Arabic numerals, a military 24-hour track, and simple three-hand-plus-date layouts.

The Khaki Field Auto 38mm (H70455733) sits within this modern collection as the automatic, display-back variant of the line, distinct from the separately numbered Khaki Field Mechanical models that use a hand-wound caliber and revive a closed-back, flat-dial aesthetic closer to the original military pieces.

In HiConsumption's hands-on review, Ian Rebello reported that the 38mm case fit "just about perfectly" on his 6.75-inch wrist, while noting it "wears just a hair larger than its diameter suggests." He described the watch as versatile enough to move from "a weekend hike all the way to the office," and called the 80-hour power reserve practically useful, writing that the watch could run from Friday to Monday and "still [be] ticking."

Rebello's review, which covers the steel-bracelet configuration priced at $845, noted that the three-link bracelet tapers from 20mm at the lugs to 16mm at the clasp but lacks quick-release spring bars and on-the-fly micro-adjustment. He also flagged the sapphire crystal's lack of an anti-reflective coating as "the single most common knock owners have," and observed that on the green-dial version the Super-LumiNova illuminates the hands and minute-track dots but leaves the numerals unlumed.

Teddy Baldassarre's review, by Erin Wilborn, focused on the value proposition of the line as a whole, describing the Khaki Field Auto as priced "just under the $800 mark when paired with a strap" and calling it "one of the most attainable Swiss-made watches, period." WatchGecko's Rob Nudds, comparing the Auto against the hand-wound Khaki Field Mechanical, wrote that he personally favors the Mechanical's flatter, matte dial and closed caseback as more true to a traditional field watch, while acknowledging the Auto's 100m water resistance is a meaningful practical advantage over the Mechanical's 50m rating, which he called "a huge disappointment" in the Mechanical's design.

H70455733 is the black-dial, leather-strap version of the Khaki Field Auto in the 38mm stainless steel case. Monochrome Watches' coverage of the line shows the same 38mm case (and a larger 41-42mm case) offered across multiple dial colors and configurations: current references include black, and Monochrome's report on the 2025 update added dark blue and khaki green dials with sunray and snailed finishing, available on either a brushed stainless steel bracelet or a leather strap.

Hamilton has also produced the same H-10-powered 38mm architecture in titanium. Monochrome's report on the titanium references describes 38mm and 42mm titanium cases, offered brushed or with black PVD coating, still built around the Calibre H-10 with the same 80-hour power reserve and 100m water resistance as the steel models.

The Khaki Field Auto naming should not be confused with the separately referenced Khaki Field Mechanical line, which shares the 38mm case diameter but uses Hamilton's hand-wound H-50 caliber, a thinner 9.5mm case, a closed caseback, and only 50m of water resistance, per WatchGecko's side-by-side comparison. Hamilton has also released limited editions built on the Khaki Field Auto 38mm platform, such as a Call of Duty-branded special edition, which are separate references from H70455733 but share its core case and movement architecture.