I believe that the actual tax disc slips into a recess on the other side. That side gets glued onto the windshield facing outward. The Lotus badge faces into the car.
I thought it was for a parking tax disk. I have been to a number of smaller cities that require "tax disks" to park. They are specific to each city or county, I think. The aluminum would stuck yo the windshield and the "tax disk" would slide into the pocket formed between the aluminium and the windshield.
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