This is a NOS, new old stock, can of GM valve grinding compound.  It is fresh from an old service station/car dealership that closed decades ago.  It is in great condition with minor handling wear and displays very nicely with great colors.  It would be a great addition to your GM advertising collection.  The pictures tell the story.  I don't think there's many of these left to be found in the wild.  I can be reached at: 262 573 193 1 if you'd like to talk about it.  Good Luck.