MZ-10 is one of the few Pentax cameras of that era that can properly use an M- or K-series lens; it's not one with the now-common "crippled" lens mount. But (if it's not too late) be sure it is a working sample before you give up your cash. These had a tendency for a plastic gear on the mirror motor to crack, resulting in intermittent stuck-shutter symptoms.
Would you mind explaining the best way of looking over a camera before buying?
I'm planning on picking it up this weekend.