Check out any second-hand camera dealers in your area and take the stuff to them for an appraisal (say you may be interested in leaving it on consignment).
They should be able to give you a fair idea (but don't give up your day job or plan your retirement just yet )
Most cameras of this age (especially the Robot) would need servicing, of the shutter especially not to mention the meter, (any of which could cost more than the going price of the camera in the open market).
Then again, the market for "film" gear is relatively limited, and there are plenty of K-1000s around.
Finding someone willing and able to service a "Robot" could prove to be difficult and expensive, so again, the market is limited to niche collectors able to do their own servicing/repairs.