Daniel, I am glad you saw/see that "ERIE". And also, the two companies did not start about the same time. Griswold started around 25 years BEFORE Sidney Hollow Ware. Me, I think that when Griswold went away from the "ERIE" markings, they sold their patterns. If you look at the Blue Book, "Sidney Hollow Ware" was only in business a very short time, and then was acquired by Wagner, and was helped start up by Wagner, but then when Sidney Holllow Ware starting competing too heavily with Wagner, Wagner bought Sidney Hollow Ware, so it even could have been that Wagner got the patterns from Griswold and then gave/sold them to Sidney Hollow Ware. Thats my thinkin of a possibility and I'd say without evidence to the contrary that its a good a possibility as any.