About this 3D model

I designed this for my Stargate Geocoin (http://www.geokes.com/en/Geocoins/Navigation-space/SpaceGate-Geocoin-Antique-Silver.html?cur=1&lang=1&&redirected=1). This one is 3,5 mm thick. You can resize it for bigger coins. Geocoins are part of a globar hunting treasure game called Geocaching (http://www.geocaching.com). Hope you like.