Dr. August Nagel had been one of the founders of Contessa-Nettel which later merged with ICA, Ernemann, Goerz. to form Zeiss Ikon in 1926, with the Zeiss Foundation being the major shareholder. It was a merger forced on the smaller companies who were struggling to compete due to the economic situation in Germany.
Nagel left, founding Nagel in 1928, he didn't use Zeiss lenses, and chose Schneider instead, then quite a small lens company. While relatively successful, Nagel sold the company to Kodak in 1931. They expanded the export of cameras made in the Nagel factory, particularly to North America, a consequence was Schneider's expansion and the introduction of newer lens like the Angulon, and fast S-Xenar
Your camera is one of the last before the Kodak takeover.
Ian