Hello Nicolas!, as our mutual friend Abel pointed out, it is so nice to see such a spectacular piece and from A.R.A!!!. It looks splendid, and did not know that BC Tudors were sent to this country. I have seen some year ago an old 5512 from, a presume, early 60´s, buth the one you are sharing is on the top of the list of the Rolex & Tudor argentinian connection. By the way, some weeks ago I found a very nice blue snowflake Tudor ref 9411, from CI (Cuerpo de Infanteria) which is also seldom seen, but not as much as the one you are showing us.