This plaque depicts the emblem of Rogue Squadron, the Rebel Alliance's (then New Republic's) premier X-Wing fighter squadron.
Measurements: 200mm x 200mm x 4mm
I recommend, once you've assembled the plaque, filling the gaps with resin and then sanding it flat. There are two spaces on the back for 20mm x 10mm x 2mm neodymium magnets for mounting on a wall
Enjoy!