I recently bought one of the replica tricon switches to fit on my Golden Flash, which going by the wiring colours I think may be the same as yours. I haven't fitted it yet but I have just updated my wiring diagram in preparation based on looking at the switches connections. See photos.
When I bought my GF its wiring was a mismatch of colours so I rewired it based on a 1960 A10 police diagram (all I could find for my model year). It was done months ago so I can confirm that everything works as it should but must emphasise that the tricon has still to be tried and tested but I'm pretty confident it's ok.
So, looking at the switch I have; my figuring was: reds to headlight main & dip, pink to lighting switch, Black & brown to horn (black button), brown to cut out (red button).