I'll go with 1992 for my definition of "shiny" cards as well. The 1992 Donruss Elites are what I would consider shiny. The 1991 Elites didn't have that real shiny foil finish like the 1992 versions did. And in 1992 the Bowman set had foil cards as well that I would consider shiny.
I don't think the "dufex" printing that Pinnacle brands did came out until 1993, so that would be the same time as the Finest Refractors and SP foils.
The only other thing I can think of were the "hologram" cards. Some might consider those to be shiny. And they predate even 1992. An example would be the Hank Aaron Heroes Hologram from 1991 Upperdeck.
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