Asahi Pentax Super S2 - Second Series.
There were two Series of S2 Super
The first Series of S2 Super was an enhanced S2 with 1/1000 second top speed. This was supplied with an Auto Takumar 55 F2 Standard Lens
The second Series of S2 Super was a further enhanced S2 with 1/1000 second top speed and a self zeroing exposure counter as used on the S1a and SV This was supplied with the Super Takumar 55 F2 or 55 F1.8 Standard Lens
Two types of the second series of S2 Super exist. The two types are differentiated by the colour of the letter "R" on the rewind knob as is the case with the S1a and SV .The earlier Type I had a Green "R" and the later Type II from 1966 onwards had an Orange "R"
From Asahi Pentax - S / H Series