In 1972 I was the chief scientist of a NASA funded project to investigate the application of data from the first earth resources satellite (ERTS-1) to coastal fisheries. I needed some way for my field crew on three vessels to accurately time sampling since the vessels lacked chronometers. I approached Rolex to provide chronometers and they gave me a GMT Master and two Milgauss. Their interest was to compare the performance of the Milgaus vs. the GMT in a machinery intensive environment. As I recall they were evaluating whether to upgrade the magnetic protection of the GMT in the increasingly electronic environment of jet aircraft.
At the end of the field season I gave the two Milgauss to others involved in the work and kept the GMT.
Of course if I had been prescient I would have kept those two watches, and not later sold the GMT; or my red sub in the 1980s, or for that matter the PCG 5512or13 (I don't know which it was) that I bought in 1963 as my dive watch, but sold in 1969. Too late smart too soon old.