W2 Cossor Wuncell Dull Emitter from 1924 MINT New Old Stock set of triode valves

Description

In 1923 Cossor launched the first  dull emitter valve unlike P1 and P2 which were bright emitter. The structure of the W2 Wuncell is similar of P1 and P2 .

Such a valve could be operated from a 2 Volts accumulator set.

You can clearly see by the pictures all four valves are intact and never been used a single time!