Hi I've been offered a Rolleiflex 3.5 Schneider-Kreuznach Xenotar with a removable viewfinder and a light meter. The serial number is 1776517. I'm having trouble identifying what model this is. Looking up here Post-War Rolleiflex 3.5 serial # at Rolleigraphy Seller claims 1952-1953. Serial number seems to indicate a 3.5E 1956-59 and that this serial number should have a Planar lens ?