I have been offered a very good deal on a black Leica M6 TTL with Summaron 3.5cm f3.5 lens. The thing that confuses me is that the price is an absolute deal in my favor and there is NO serial number stamped on the top plate. Below are some pictures of it. Can anyone tell me if this looks real or shady? Would love to know before I make the drive to complete the transaction. Thank you for any help.