Mr. van Hoesen states that the drawings for construction of the watch were begun on August 10, 1937 and the adjusting completed on March 21, 1938. The movement has 23 jewels, including jew
In addition to these tests the watch was also tested in 6 positions at 5 different stages of· winding. In none of the positions was isochronal error in rate greater than 3 seconds noted. Since this probably did nor persist for a greater period than a few hours the cumulative isochronal error was exceedingly small.
Besides exhibiting a knowledge of watch construction Mr. van Hoesen has demonstrated remarkable ability as an adjuster. The hairspring of the watch is fitted with both outer and inner theoretically correct terminals, the exactness of which is proven by the rates.