...perhaps this is what people are thinking of, when they say they saw it for sale on eBay previously; a post from last September when the can was offered for $2800:

http://www.oldgas.com/forum/ubbthreads.php?ubb=showflat&Number=665530

Looking for better Gulf items: signs, globes, cans and paper - especially porcelain Gulf flanges, and Gulf A-38 & A-62 ad glass...