08/31/2007. Flown in 1936 the sole four-place amphibian F-4 (also
known as F-401) was registered as NX16793. Sold to a mining company
in Canada were it was registered as CF-BGZ, but returned to the USA
in 1940 registered as NC16793 and is still on the register as of this
day. View also photo 2177.