Rolleiflex Automat B model K4B - Tessar 1:3.5 f=75 mm Film Camera - SN 1488434
Classic Rolleiflex model, produced between 1954 and 1956. Ottica Zeiss Tessar 3,5/75, otturatore Compur. Zeiss Tessar 3.5/75 lens, Compur shutter. Since then, it has shot 6-7 rolls of 120 film (square format isn't my thing!).