buying a 2nd hand RF

[Stoned]

Im thinking of getting a second hand RF and I realised I'm not quite clear about what to check. Other than the usual film compartment, meter, lens , shutter curtain, is there anything else that I've missed out that is crucial to check before buying a RF?

The RF in question here is a Minolta Himatic 7sii

 

[ricohflex]

if it is below $80
don't worry too much
your rough check is enough.

 

[Stoned]

If it's above 80?