My main interest in the early Imperial packaging came about just recently because of unknown Vacors. There are some late 70s packages with made in Mexico marbles in them which seem like they would have Vacors in them. The opaque patch type marbles look more like Asian made patches than later Vacor patches, but they have to be Vacors, right?. Does anybody know if there was another non-vacor Mexican machine made marbles producer in the late 70s? I know many consider these marbles total garbage, but I still like a mystery wherever I may find one