The Gillette Executive is just a Fatboy Adjustable plated in gold rather than nickel. The only other difference is that the knurling on the twist knob is a little bit different than on a standard Fatboy. The Executive was produced from the second half of 1958 through 1961. This one is from the 3rd quarter of 1958, the first quarter Executives were produced.
This Executive works great, and much of its gold plating is intact, but it is missing plating in a couple spots: both guard bars, one side of the top, and on one side of the TTO knob (see photos)