This camera was sold to me as a Contax 'D', but I think it is most likely an 'S' type D-2. The D should say CONTAX D on the pentaprism, this one just says CONTAX. However, given the wide variety of labeling on these cameras anything is possible. Depending on which web site you're reading, the D may be identified by the sync connection on the top plate, but other web sites say that the S D-2, which was the last S model, also had the sync connection there. The lens may not be original to the camera, its serial number indicates that it was manufactured between 1952-1955. Most documentation I've found says that the camera was sold with a 58mm F2 Biotar lens, this is a 50mm F2.8 Tessar. So it's either an S with a non-original lens, or a D with a possibly original lens. If anyone can make a positive determination, please let me know.
Shutterbug included this camera in their list of the 20 most significant cameras of all time because it was the first 35mm pentaprism SLR (note that it was not the first SLR, just the first to employ the pentaprism that became the universal standard for SLRs).
Condition is excellent, everything including the slow speeds seems to be functioning. I intend to put a roll of film through it and will post the results here when available.