Siemens and Halske W28 model rotary dial telephone commissioned by the Deutsche Reichspost [German Post Office) as its standard issue model from 1928. In the mid-1930s, the Reichspost commissioned a new model seeking a more economical and reliable device. They passed on the model produced in 1936. The W38 model was adopted but not introduced on a large scale until 1940. Some parts, such as the bell, were made of different materials due to war economies. The W38 was sturdier and introduced a dialing pause to make connections more consistent.