During WW2 there were two types of blackout headlight switches used on US military vehicles. Earlier vehicles were fitted with a push/pull switch whilst later production vehicles used a five position rotary.
I assume the M8/M20 went through this change also.
The main difference in the function of the two switches was that the BO Driving light control was incorporated into the rotary unit instead of having a seperate, dedicated, switch on the dash.
David
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Hell no! I'm not that old!
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