You are looking at a Star Trek DS9 USS Defiant Deck Plan Schematics Plaque from Rene Auberjonois.  Plaque reads Season 6 97-98 in the lower left corner. This is a 3D representation of the construction of the ship done in the same colors as some of the displays on the ship's bridge.  I will have a few more items I will be listing from his collection That I acquired.  As he put it, this stuff was just sitting around in boxes in storage and it was time to get rid of it.  This is truly a unique piece that would be great addition to any collection.  Thanks for looking.