I have nearly completed the restoration of my 1970 BSA and need to replace just one more part, the turn indicator switch. The bike did not come with turn signals and I retrofitted a set of Yamahas and replaced the Lucas horn/dip switch with a Yamaha horn/dip/turn indicator switch. This was about 1975 or earlier. Since I was working with a parts guy I have no idea what model or year bike the switch came from and without it I cannot get a part number. The switch is marked "Yamaha, YHA 203" on the underside.
If anyone has a vintage bike with that switch I would greatly appreciate the model and year.
Thanks.