Found a sword buried in the desert and it is marked Carlos V, made in Spain, how do I find out if it is real?
To know if this sword is real or not, you will have to take it to the appraisers or collectors. This is because Carlos V swords have the name indicated and so it will be hard to know if it is not real if it has the name on it. Check out http://www.medievalcollectibles.com/p-1362-carlos-v-sword.aspx.
Take it to a dealer