Zeiss Biogon 4.5/21mm “Cutaway”
1952
Original factory-made cutaway model of the Zeiss-Opton Biogon 4.5/21mm for Contax (prototype no.5 of the Biogon 21mm). Cutaway models of Contax lenses are a sought after rarity - not to speak of a prototype model!
Photo credit: © WestLicht Photographica Auction