I'm sure the true hassy experts will fill in the exact details, but I do know that SWCs were sent in for factory conversion to /M status, allowing a polaroid back. So those show up from time to time. I would say the older version is totally worth looking at, the lens is amazing, and service is still possible. If the price is good and the dealer legit, why not? I've had one for a few months, and I think it is pretty special. Very quick to use.