This linesman's handset has an earpiece, a mouthpiece, a dialling interface and a set of test leads for connecting to the telephone circuit. This handset has a rotary dial and a hook for hanging the set from a toolbelt. Made of black bakelite. Patent - for improved number dial.Large dial with numbers 1 to 9 + 0. Small dial with letters A, B, F, J, L, M, U, W, X, Y around outside. Telephone No. . . . . . . Listen for dial tone AUS PAT 5338122 BRIT PAT 289244telephone, linesman's test phone