There is some speculation that the ones without the tang markings were not shipped to Argentina, but sold in States. George Layman has the difinitive book on the subject of military rollers. Also lots of guns built of surplus parts after Remington went through bankrupsy and was bought by Schuyler, Hartley and Graham and sold domestically. They did not ground off the Modelo Argentino markings during refinish - or on some unrefinished examples - it was just never there on many.