ID:
2017
Maker's Name:
Unknown
after 1920
Dimensions:
3.9 × 3.9 × 9.2 cm
Thermionic valve diode. Glass envelope, 4 pin crucifix bakelite base with sprung pins.
There is no maker's name but there is a logo showing a windmill.
2017 - Valve Diode 1920+ (after 1920)
