Wipac Triconsul Switch question

Help me identify this switch. I have several original Triconsul switches. They all have the same wiring colors that match the wiring diagram. But one of the switch bodies is made of black plastic while the others are chromed metal. All have the black horn button and the green flasher button. What model had this plastic body switch installed on?

I guess the early ones have the full chrome body. I also have a Triconsul switch on my 1970 Commando with black body and a brown flasher button instead of a green one. My spare one has a full chrome body and a green button.

Mine was chrome on my Apr 69 S version. Can't speak to the black plastic ones. But I replaced the innards, so I can't remember what colour all the buttons were.
Later: I found a pic of my original one and it had a black and green button, looks like the switch was black but it was broken off when I got it, that's why I replaced it.