Back to the classic cameras today. This is the lens of my Zeiss-Ikon Nettar. It's a Novar Anastigmat 75mm f/6.3 (3 elements, coated), with a Vario shutter 1/25 - 1/200 + B, and was made in 1949 - the first year of production post-WWII.
One website describes it thus; "Nettar is a folding 120 roll film camera. It could be considered as a basic model of that camera type,designed for general amateur photography, so to say". Even as a basic model, however, the build quality of this unit could teach many modern manufacturers a few lessons - it's more than 60 years old, and still works like a dream!