BC 3050 Telephone consists of: Microphone RE 9310 with cord RS 4250 and two-part plug.
Polished walnut wall plate.
Ringer of 3ohms.
Signal push button.
Hook for hanging the microphone.
Taken from the L. M. Ericsson Telephones and Signalling Material Catalogue No. 188 Supplement 5 (1938)