Camino de Santiago pendent that has a shell on the front, and "Camino de Santiago" engraved on the back. Comes with a black cord. Pendent is slightly larger than a 50 euro cent coin, about 25mm.
I think most of the suggestions are sound ones except for carrying a lot of cash. I once crossed the U.S.‘Mexico border at Tijuana with three Navy Recruiters riding in a car with American plates...a sure tip off for the cops to stop us...our...