This is one of those elusive jars that has not been well documented. According to a Cookie Jarrin, November 1994 issue, the Grease Monkey was offered as a premium for $2.95 when you had your car serviced at a Grease Monkey (automotive) store. Circa-1960-1963 size-10.5" x 6.75" valued at $400.00-$600.00