W.B. electronica Mini Comparator Type 434 Speaker/Amplifier Switch, made in Amsterdam

Link: radiomuseum | radiomuseum | gracesguide

Country:  Great Britain (UK)

Manufacturer / Brand:  Whiteley Electrical Radio, Boneham & Co. Ltd. (WB, Stentorian); Mansfield

alternative name Whiteley Electrical Radio Co. Ltd.; Mansfield
Dimensions (WHD) 308 x 80 x 170 mm

а при чем тут amsterdam на лицевой панели-то