'The Lissenola' from Lissen Ltd., of Richmond, Surrey.

Founded 1923 Initially Lissen Ltd. manufactured radio components and supplied complete kits for home construction of radio receivers. The Company was purchased by Ever Ready in 1928, and in the following year entered the valve business. In the earlier years they sold probably only redundant stocks from BTH and Edison Swan but may have fitted their own bases. In later years the valves were from different British and foreign sources.
Quelle