These early Gillette Techs are distinguishable from later models by the rounded-triangle-shaped slots in the baseplate, as compared to the oval slots seen on later models. Known as Early Techs, Triangle Techs, and Pre-War Techs, they are less common than later models and also shave a bit more efficiently than later Techs.
Right now, we have two available. One is a relatively common nickel plated Triangle Tech that is in really nice shape: used, but nice and shiny with no plate loss. The other is a much less seen variant, a two-tone gold and black Triangle Tech. The black portion of the handle does not seem to be painted, but I'm not sure by exactly what process it was colored. Gillette described it as an "ebonized handle" in advertising when it was introduced in 1941. This one has no plating left on the top cap, exposing the red brass and making it more of a three-tone look in this case. A bit of the ebonizing has begun to wear off as well.