The Zeiss Ikon Nettar 518.16 is a medium format 6x6 Folder with a 75mm f4.5 Nova - Anastigmat lens and shutter speeds to 1/200 second that was produced from 1949 to 1957.
Compared to the Agfa isolette, the Zeiss Ikon Nettar is a high quality camera. Indeed is is very nice to use, with a good solid feel to it and a quality finish. Like the Agfa, it folds to a neat package that easily fits in a pocket, particularly because it folds nice and flat, unlike many modern point and shoots.
And after 50 years of use the bellows are still light tight - this was tested by shining a torch inside the bellows in a darkened room and looking for any pin holes, especially in the folds. There were none - unlike the Agfa isolette already mentioned. I’m sure that the difference is due to the quality of the materials used.