(Click at the pictures to see a real version of the phone).

1908 Model 'Hildesheim', First type of an Automatic-wall- telephone, introduced for the first automatic exchange in Hildesheim/Germany in 1908. Manufacturer were the german 'Deutsche Waffen- und Munitionsfabriken Karlsruhe' and 'Siemens & Halske' - case of walnut - 1 telephone with ringmagnet - carbon-granule microphone,   adjustable for height - induction coil - dial switch like one of the   'Automatic Electric Co., Chicago' - push button for ring up the called   party - local battery for the microphon - polarized ringer

1908 Automatic-table-telephone, introduced for the first automatic exchange in Hildesheim/Germany - case of walnut - handset with telephone and carbon-   granule microphone - induction coil - dial switch - push button for ring up the called   party - local battery for the microphon - polarized ringer