This and the Model 300 was produced in the mid to late 1940's by the Pacific Safety Razor Company of California.
There are two versions of it, this one is the 100. The differences from the Model 300 is that the handle contained a set of nail clippers and the color of the handle. The nail clippers are a bit akward to use. The case is has a cream base with a black top.

The rest of the razor is the same and lets move onto those features.
  The ball-joint means that the head is pretty much infinitely adjustable and it was advertised as "COMPOUND ANGLE ADJUSTMENT"
  Its also a Differential head and this was advertised as "SELECTIVE SHAVING CAPS"
  The Clear bar was advertised for "Tough or Long Beards" and the colored bar for "Average Beards".
  The bars also roll, but I doubt that they actually do while shaving as they are made of a smooth plastic.
  The head is zamak, as previously mentioned the rollers are plastic and the rest of the razor is aluminium.

How does it shave?
Its a very mild shaver so don't expect a BBS out of it...