Non of my 'standard' literature mentions Ikomat at all (Tubb's Zeiss Ikon Cameras 1926-1939, and The Hove Blue Book, Millennium edition). I have only found a couple of mentions on the Interweb - nothing detailed.

Matt's Ikomat has the same die cast body as a Netter 515/2 but that cheaper camera has a Nettar lens instead of a Novar (both triplets. The Novar being made by Rodenstock, I think, and the Nettar is an old Contessa Nagel design from before the merger that formed Zeiss Ikon).