If you are talking about the thickness of the boards that supers are made from, yes, 7/8 inch was the standard thickness for dressed lumber prior to 1961. It was reduced to 3/4 inches either by government standards requirement or by the lumber industry agreeing to the reduction because of the quality of timber being harvested.
Originally, 1x lumber was 1 inch actual thickness. But that was when lumber typically came from small, local mills and planing lumber was not a standard practice. As railroad networks grew, so did the size of lumber mills and regional transportation of lumber. Then lumber size standardization came about. And that standardization evolved over time.
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