Zeiss Ikon Ikonta 520/2 Folding Roll Film Camera.Made c-1927-37, it uses Common 120 roll film. It's shutter works Well at All speeds and the f 4.5 Dominar Anastigmat  lens,  is considered a "Premium Tessar Alternative". The Oil free diaphragm works Smoothly, as does the focussing adjustments. Both sports and waist level viewfinders also Work well. The really Nice Leather bellows are Llight Tight, and extend and retract as designed. Front and back doors work Easily. Use it or display it, This Very Early model, in this condition, is a Rare prime survivor. Listing as is described.