Ergo Plate camera 1926-1931
From the Contessa-Nettel company Zeiss Ikon inherited the Ergo camera for the 4,5x6cm plate format.
The picture above is from the catalog C 292 b, dated October 1928.
Even during its short production/selling time as a Zeiss Ikon camera the Ergo changed from Bestellnummer.
The next table lists the original Bestellnummer starting in 1926 next to the newer one, late 1928/early 1929.