Very, very nice Rolleiflex 3.5E, equipped with a Schneider Xenotar 75mm f3.5. It is in lovely condition but not perfect.  There are couple of minor rough spots on the leather but no damage and certainly not glaring. The glass is clean and the shutter performs well throughout its range. The place where the serial number usually is is blank (top of name plate), indicating that some repair was performed at some point that required a replacement name plate.  Thus , it is hard to pinpoint the manufacture date. The 3.5E was made from March 1956 to February 1959.  The lens serial number places it somewhere from late 1957 to mid 1958.  1958 is more likely as earlier 3.5E models had an internal light meter and in 1958 Rollei introduced a less expensive 3.5E version without the meter.  It was, however, wired for the meter and could be retrofitted later.  Note the name plate; below ROLLEIFLEX is where the meter sensor would be. If you could find a conversion kit you could make this a metered camera.