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American Hamilton Model 21 Marine Chronometer

Since its invention in 1761 by John Harrison of England, the marine chronometer has been used for navigational purposes.  Its precision and reliability for accuracy to within seconds is truly remarkable.  As a result, many marine vessels stayed safe and on course for hundreds of years.

This chronometer has its origins with the U.S. Army.  Hamilton was one of the American watch companies enlisted by the U.S. military to produce chronometers in anticipation of WWII.  Hence, the Hamilton Model 21.  The National Museum of American History explains that Hamilton “introduced key changes to improve accuracy” for its Model 21 chronometer.

This Hamilton chronometer has a 14 jewel chain fusee driven movement with chronometer detent escapement.  It also features a poised balance wheel and maintains a 56 hour power reserve.  It has an engraved silvered dial with Arabic numerals, seconds dial, and winding status indicator. Additionally the dial bears the signature “Hamilton, Lancaster, PA., USA; Property U.S. Army.”  The chronometer comes in a gimbaled mahogany case with winding key and a one year warranty.  What a terrific piece of historical time keeping!

7 1/2″ High x 7 3/4″ Wide x 7 3/4″ Deep

Circa 1940

SKU: LPEC 117 $4,250 Inquire
If you would like to purchase this item or learn more about it, please click on the Inquire link above or phone the Renaissance Showroom at 805-688-1976, open seven days a week from 10 to 6.
  • American
  • Hamilton, Model 21
  • Marine Chronometer
  • Mahogany Gimbaled Case
  • 56 Hour 14 Jewel Fusee Movement
  • Engraved Silver Dial
  • One Year Warranty
  • 7 1/2″H x 7 1/2″W x 7 1/2″ D
  • Circa 1940