looks abit like a toggle only rotary , has a small bulb that lights up the very center of the handle
On mine the handle is white plastic, and has a down ward pointing lever to actuate it. Be very care full with the switch! They are some what rare, and it would be costly to replace it.
Does your machine have the aluminum head, headlight pull switch with the blue light in the center to tell you the lights are on? Again a very rare switch. I do not think there are any reproductions made for either of these switches. Porsche files would love to find them, as I have been told they were used on the 356 speedsters..
How about and original hour meter, does yours have one of those?
Regards, Kirk