Back in the 80s Topps produced All Star cards that were inserted into their cellophane wrapped multipacks of cards ('rackpacks') so that you could see the card in question. That was helpful if you had one particular favourite player, or were collecting the set. It also meant an extra Tony Gwynn card to collect in the seasons after he was an All Star.
Card Number 637: Topps Glossy All Stars, 1986; #17
This card has a varnish finish to make it glossy, however Tony's skin is noticeably shiny too! Although this looks like it was taken outdoors, I suspect that shine is caused by a lamp rather than the sun. It looks unnaturally lit.