Signedunsigned [however label fragment on front of device reads "este" in a similar manner as 1997-1-1393]
Inscribedstamped, on top: RET 123 B
marked in orange, on top: L2
FunctionThe retardation coil is used in telephone circuits. Between the retardation coil, the condenser, and the receiver, the circuit is able to regulate the kinds of signals that flows through the receiver (i.e. at different moments during the call, this system may permit, impede, or retard low-frequency ringing current).