The seller ran some rolls of film through it recently and said everything works fine.
Tread cautiously.
There can be found good, bad, ugly and terrible specimens of these behemoths. At the other end, you can find some that have barely been used at all (in itself, not a good thing for the arcane shutter mechanisms these cameras have). I bought mine mint for $576, body only, ex-USA and it was bench-tested by service before it left. What a seller says has no relevance unless you have proof of future reliability from the moment the camera is put to good use. If it is the old model 6x7 there is a very high potential for wear/age-related problems to develop, and none of the 6x7 or 67 variants are easy to service. The TTL meter is rudimentary in its operation and should ideally be supplemented in difficult light by a hand-held meter, very especially if you are using a polariser. It does nail the exposure more often than not, but again, if there is evidence of physical damage to the prism, or wear of the foam seals ... buyer beware.
Mirror lock-up is very useful but it can also exhaust the battery if it should be activated when the camera is packed away; solution: tape the MLU button so it does not move. MLU is very useful for close-focus or macro, but it still requires a huge amount of care to trigger the camera without encouraging vibration. The 105mm lens, if it is the Takumar version, will be "OK". Optical quality among the Takumars varies wildly while the later SMC Pentax 67 version lenses raise the bar and are still sought after today for serious landscape and portrait work. The 105mm is the standard lens with the next best standard optic being the 90mm (f2.8). This start-up kit could be of use to you (are you into macro or close-focus?) but my concern is reliability and the history of the camera. The 6x7 bodies would be getting close to 30-40 years old now (67 bodies from 1990 to 1991 are a better buy) and if they have been subjected to persistently rough professional service (even occasionally), you should be open-minded about the possibility of a fault, one of the most common being stripped pawls in the winding mechanism.
A camera that has been dented, bashed, bruised, scraped, cracked and then offered for sale in "excellent condition" must be avoided as a liability. I don't care what others' definition is about "excellent" in the presence of dings. I suggest if you can to handle the camera before purchase and inspect it very carefully. I doubt the seller would allow you to run a roll of film through it (remember also that loading an unloading a 6x7 /67 is a fumblefest...) but it might give you that extra bit of reassurance you need over the spoken word of the camera being good for service.
