The ref number 110A/339 would imply that the type 3 is of perhaps Canadian supply whilst the 10AD/68 on the type 71 would probably make it a standard British supplied item and the serial number 260/46 is probably denoting 1946 as the year of manufacture. As for the differences I am afraid I cannot help!

On Vulcan autopilot panels (which were used as somewhere to put cups of tea/coffee/juice/soup – and inevitably spilled) I used to remove the panel, take it to the toilets and give it a brushing with standard RAF soap and water. It worked a treat. However it may not be a recommended technique in your case.

Not the yellow bands but may help:

Whilst not an expert, I reckon both these ref nos come out as what would be called dolls eyes. I can find little authoritative reference but 5074 is a Mk1 Type B2 which shows Flourescent White and black when energised, but these pictures show some differences, 5CZ5071 on the left, 5CZ5074 on the right:

This is supposed to be an ANT 18 panel, but most Link Trainer panels seem to vary, perhaps depending upon the customer’s requirements.

Any use:-

Thank you, ozjag, for getting back with that info.

Terry