Whilst cleaning up, I rediscovered an ignition and lighting switch. It is one of those pieces that is picked up an moved but never carefully examined. As my T is a 1922, the switch is "pressed" tin. This switch is much better made and with a cast lever. I checked in McCalley to discover it was in limited use in 1919. The panel was trimmed to eliminate the ampere meter. Made by Briggs and Stratton.
Odd, looks like the back plate is fastened with two screws?
The more common later versions fasten the back plate either with pins that looks into the sheet metal when turning or tabs that must be handled with care so they won't break..
The early switch was unique - I'm guessing that is a 1919 version
I had one like that, that had spring loaded ball bearings as contact points.It was very sturdy.