Trona Plate cameras 1927-1938
From the Ica company Zeiss Ikon inherited the Trona camera for the 6,5x9cm/9x12cm plate formats.
The picture above is from the catalog C 292 b, dated October 1928.
During its production/selling time as a Zeiss Ikon camera the Trona changed from Bestellnummer.
The next table lists the original Bestellnummer starting in 1926 next to the newer one, late 1928/early 1929.