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The Hamilton 987S is one of the most historically significant American watch movements ever produced. It was Hamilton’s first hacking wristwatch caliber, meaning it featured a small mechanism that gently engaged the balance wheel to stop the seconds hand whenever the crown was pulled out to the time-setting position. That may sound like a minor detail today, when hacking seconds is standard on virtually every mechanical watch, but in the early 1940s it was a feature of genuine tactical importance. Military operations depended on precisely synchronized timekeeping across entire units, and the ability to stop the seconds hand, set it to match a reference clock or radio signal, and release it in unison with other watches gave soldiers a meaningful advantage in coordinating movements, artillery barrages, and naval maneuvers. Hamilton produced the 987S with center sweep seconds and this hack function between 1941 and 1948, and the caliber found service across multiple branches of the U.S. military, from Army Ordnance watches to Navy and Marine Corps aviator timepieces, and even in watches supplied to the Royal Canadian Air Force. During the Second World War, Hamilton ceased all civilian production entirely, devoting their Lancaster, Pennsylvania facilities exclusively to military timekeeping instruments, and the 987S was at the heart of that effort.
The movement photo of this particular watch reveals the caliber in all its American-made glory. The 987S is fully signed “Hamilton, U.S.A., 17 Jewels, 987S” with the serial number SS28891 visible on the main plate. The architecture is purposeful and robust, with clean bridge work, visible jewels in their settings, and the characteristic golden gear train that gives these Hamilton movements their distinctive visual warmth. You can see the large sweep wheel that drives the center seconds hand, the defining feature that distinguishes the 987S from the earlier sub-seconds 987A. The movement was manufactured entirely in the United States at Hamilton’s Lancaster factory, a point of genuine pride in an era when most affordable watches relied on Swiss or Japanese ébauches. This is a true American-made movement, from mainspring to balance wheel, and the quality of its construction reflects Hamilton’s position as the premier manufacturer of precision timekeeping instruments in wartime America.
The dial is a fantastic survivor, with the kind of character that only eighty-plus years of honest life can produce. The original cream surface has developed a warm, rosy, almost salmon-like tone that varies in intensity across the face, lending the watch an organic warmth that is impossible to replicate. The bold Arabic numerals are rendered in a sturdy military typeface with radium lume fills that have aged to a deeper, earthier tone, and the spade-style hour and minute hands carry matching luminous fills in their broad tips, the kind of hands specifically designed for legibility in low-light and nighttime conditions. The center sweep seconds hand is a slender blued steel affair that adds a refined visual counterpoint to the bolder hour and minute hands. “Hamilton” is printed in the company’s classic serif font just below center, and a fine minute track with five-minute numerals runs around the outer edge of the dial. The overall impression is one of tremendous warmth and authenticity, a dial that has witnessed decades of use and emerged all the more compelling for it.
The base metal case, manufactured by Keystone (one of the major American case makers that supplied Hamilton’s military production), has developed a rich, warm patina that ranges from a deep brass tone on the bezel to a more weathered, aged finish on the lugs and case flanks. The caseback interior is stamped “Keystone, Base Metal, 508179, RP615,” along with various service markings. The case shows the kind of honest, all-over wear that confirms this watch was worn regularly and hard, which is exactly what it was designed for. The profile shot reveals a relatively slim case with the crown sitting at three o’clock, its knurled edge worn smooth from decades of winding. The lugs are drilled, and the overall proportions remain tight and true despite the years.
For the collector who values watches with genuine military heritage and the unmistakable presence that only wartime pieces possess, this Hamilton 987S is a deeply meaningful acquisition. It represents a specific moment in American history when the country’s finest watchmaker turned its entire industrial capacity toward the war effort, producing precision instruments that helped Allied forces coordinate the operations that would ultimately win the conflict. The 987S movement is the direct ancestor of every Hamilton Khaki field watch that followed, the mechanical DNA that connects today’s modern Khaki Field Mechanical all the way back to the beaches of Normandy and the jungles of the Pacific. Paired here with a rich brown leather strap, it wears with the quiet authority of a watch that has earned its patina the hard way, and finding one with this level of original character, with movement, dial, and hands all telling the same consistent story of age and use, is becoming increasingly difficult as these wartime Hamiltons continue to be recognized for what they truly are: pieces of American history that you can wear on your wrist.
