One P42 is missing it's red reset (?).

Power Type: DC
Assembly Status: Ready to Go/Pre-built
Scale: 1:76
MPN: RT42, P42
Material: Plastic, Pressed Steel
Control System: Analogue
Gauge: OO
Vintage: Yes
Colour: Black
Brand: Tri-ang
Type: Speed Controllers
Voltage: 12 V
Model: Control Unit
Country/Region of Manufacture: United Kingdom