1962 Pentax S1a. This is the second release of the S1a, which was available from 1964 to 1968. The version can be identified by the Orange colour of the "R" rewind symbol, with the first version being green.
The second release had a modification within the mount to accept the newly released Super Takumar 50/1.4, as compared with the Super Takumar 55/2 common on the first release.
1962PentaxS1aBlackAsahiPentax S1aAsahi Pentax S1a
From Asahi Pentax - S / H Series