We have some green ones on hand here at the museum, and the design records mention them as well. Never seen red in that position, not a similar jewel on any CMP. The trailer T sign has much smaller red reflectors....we have one of those here as well.
Red was never a standard for the front of a vehicle...amber was. Green seems to have stuck around into the 50s. My 56 C500 DND firetruck has green lamps on the hood for clearance.
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