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If there is a film in the camera, then the interlock will prevent the film being wound on. Can you operate the shutter, or is that locked too ? If you are willing to sacrifice the film in the camera, open the back and remove it, then try again with an empty camera.
Congratulations on the aquisition of such a great vintage camera!
Pentax cameras use a mount known as M42. This means it is a 42 millimeter diamater. You may also find this referred to as the Pentax mount, as Pentax (Asahi Optical) made this popular in the United States. With any camera, any lens you purchase should match the mount of the camera in order to be used together.