The Sonnet survived the merger of Nettel and Contessa in 1919 and for a few years the formation of Zeiss-Ikon. At various times it was made in sizes of 4.5 x 6 cm, 6.5 x 9 cm, 9 x 12 cm and 10 x 15 cm. The tropical finish may have been available in only the two smaller sizes.

Several lenses were fitted in either Compound, Compur or Ibsor shutters. The camera was sold under different names depending on the country. Some models have a brilliant view-finder others do not.

This camera carries the Contessa-Nettel name and so dates to later than the merger of Nettel and Contessa in 1919. The lens is earlier being manufactured during the war. A Sands & Hunter label covers the original Contessa-Nettel badge on the top of the camera and the case also has a Sands & Hunter label. German imports did not start until around 1925 so this camera was possibly part of a batch of cameras bought by S&H, something they specialised in, or it acquired the S&H labels when sold second hand. The dark slides and film pack adapter are of British manufacture.