Do not be surprised if when you get the pictures back, that you find light leaks. I find they ALL have that. But don’t worry! With a little patience you can learn to replace the light seals yourself. Then you graduate to other repairs and before you know it you’ve developed an addiction! 😂 Also check the mirror bumpers. They tend to degrade and spray bits of black foam over the mirror and focusing screen. Of course if you really like a particular camera, a cla is always wise. Enjoy!!!
The nice thing about Pentax is the K mount lenses have been used since the mid 1970'S and cheap used K mount lenses are readily available on the used market as well Pentax Takumar M2 Screw lenses from the 1960's can be used with a adapter on the film camera