Reminded me. In 1963 I had a 200cc Ariel Colt. On the end of the handle bar next to the twist grip was a built in mirror. I went for my driving test and failed and was told on turning right I should look behind then if all clear move to the right, Saying I used my mirror was not good enough. Good little bike , cost me a fiver. Chap also had a 976cc V twin , I bought that off him , that was 10 bob.