Phil - Don’t know how to answer that. I guess the short form answer is “No.” However, it is not quite like any other steel case round the collection I had. So, without knowing it is Spanish, I could not attribute it to any country by look. It would be an unknown to me in that instance. I have had other steel-case rounds with no headstamp, including German with the steel primer and blue seal, and German CWS type s.S. with no headstamp. Nothing like those, for sure. The round came out of Spain for me, so I have no reason to doubt its national origin.