http://www.aohc.it/slr02e.htm & http://www.pentaxforums.com/camerare...tax-s2-h2.html
Released in 1959 - same as the Nikon F, but discontinued much earlier then the F in 1961. Given the age of it and possibly unknown previous owner(s), it may require CLA and then it will be good to go for another 50+ years.

The older original and the F.