Finally, from left to right.....1957 Asahi Pentax AP, 1958 Pentax S, and the 1958 Pentax K. Both the S and K have their original lenses, but sadly, the AP did not retain it's original preset Takumar.
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From Asahi Pentax - AP, S and K models
From right to left;
The 1957 "Asahi Pentax" (AP) - Arguably the worlds first commercially successful "through the lens" SLR
The 1958 Pentax S - The S included a slight standardization over the AP. The K was released shortly after the S, resulting in very few numbers of these cameras being released.
The 1958/59 Pentax K - Adding a (semi) auto aperture.
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