A Much Sought After Vintage Longines Weems Pilots / Navigators Watch, designed by commander Philip Van Horn Weems, USN and released by Longines in 1937. The watch was issued to pilots and navigators to be used for dead reckoning aviation navigation. These models are becoming increasingly harder to find, weems navigation watch, one of the first aviation watches. This watch is even rarer as its made for the english market and has earned a lasting place in history as one of early aviation’s most reputed wrist instruments, circa 1941 Size: case 30mm.