For the record, that would be a Tech V/Master Tech cam, since the serial number of the lens that it is matched to is engraved on the top, and there is no serial number to match it to a Tech IV body on the bottom. Since it's not connected to its original lens, though, it's as likely to work on a Tech IV as on a later camera, or could be reground to match a new 75mm lens by a Linhof technician.