Erni Filmpack and Plate cameras 1927-1929
From the Ernemann company Zeiss Ikon inherited the Erni camera for the different kind of filmpack/plate formats, see below.
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 Erni changed from Bestellnummer...
The next table lists the original Bestellnummer starting in 1927 next to the newer one, late 1928.