It's a tag topper given out by shell. The strip was a banner or flag accross the shell. Here's what it should look like.
I believe it is an anti "Screw Driver" topper from Shell...."Share the Road" pg 87 in the Gas Station Memories book by motor books
What is that car in your avatar? That is very interesting looking! Wanna post up some pictures? We all want to see them, I think!
The signal flags on the emblem represent the letters G R P for what it's worth. EDIT: I found this: The ad explains, "The mariners' signal flags mean, 'I am giving way'— I'm sharing the road!"