Camino de Santiago Way Marker used to guide you to Santiago de Compostela in Galicia. This is used in urban areas (you may have seen them in the ground) where you are not allowed to paint yellow arrows. This round one is used only in Galicia.
The company that makes these is the same company that also supplies the Xunta de Galicia with markers, so this is the real deal.
Each marker is numbered and comes with a Certificate of Authenticity.
It is made on bronze and weight about 350 grams. As you can see from the photos, it is flat on the backside and can be used as an ornament inside or outside in your garden/driveway to signal the way to Santiago.
The diameter is about 11,5cm.