What exactly were you thinking about doing? A window sticker? Or incorporating a tail stripe? Single color or multiple colors? Maybe something centered on the trunk lid?
If I could make a suggestion... - I would try to modify the emblems used during that time period (1940). That way they would have a more significant connection with the car. I looked for some images on Google to get an idea of possible directions to start with.
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If you get a chance try to send me more pics of the coupe so I can get a better idea of options for you to consider.
Mr Norm had produced a Dodge Rumbler that has an insignia very close to what you might want. It could easily be modified to blend with your '40.
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You could personalize the lettering. This would be a rough example.
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