With the interest in dealer decals and emblems, I would think there would be some sort of a limited market for the stuff. A friend has a very nice '66 Chevelle. In the front window is a decal from Gorries, Toronto. From the decal I gather that Gorries was giving free lifetime lubrication to the customers.
http://community.webshots.com/album/562576047PJthNV
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.