It looks familiar but i can't place it.
The center of the design appears to be a large triangle, point downward, with an arc segment sticking out from the top. This is placed over a rectangle or shield shape, so the point of the triangle sticks out just beyond the bottom of the rectangle, or coincides with a point at the bottom of the shield. Rays or flames stick out from the upper edges. There seem to be three colors. I suspect there was a crown at the top, with two rounded shapes (letters?) below that. And then there's a trapezoid with the number 1353 in the center. I think there were two or three lines of writing below that.
I suspect we'd see more in a high resolution photo.
Here's a link to my Flickr page showing this decal in a larger format. See if it helps:
http://www.flickr.com/photos/stl914/9640166814/sizes/o/