CU1 (Control Unit No.1 Mk.II) - Radio and intercom
control box for tank commander and gunner. Has two flexible
cables with British standard quick-release connectors
(5-point snatch socket) to the Microphone and Receiver
Headgear Assembly No.1. Connected to Control Unit No.2 Mk.II
or immediately to the WS No.19 radio when tank crew was
no more than 3 people.