The Ricoh 500 is a Japanese rangefinder camera from the late 1950's that has been greatly under-rated. I wrote about that and posted some pictures about a year-and-a-half ago. I just got around to adding a page about the Ricoh 500 to my vintage cameras web site about the camera -- can't believe it has taken me so long.
I originally bought into the idea that the Riken Ricomat lens was of poor quality and I neglected the camera for a long time. Finally, I got around to properly adjusting the infinity focus and found that the lens is really a very fine performer. There are a couple more pictures from it on the web site, and there is also a slide show of shots from the camera which I recently moved to my Picassa web albums.
The Ricoh Five One Nine model was introduced a year after the 500. The f1.9 lens is reputed to be superior to the f2.8, though I'm not convinced there is such a great difference as has been alleged.
Ricoh is one of the oldest camera manufacturers in Japan; it was originally known as the Riken research institute.