Ray, this is a very intriguing and interesting box. The complete label should read:
20 CARTRIDGES, BALL
(20 CARTUCHOS, BALA PERFORANTE CON NUCLEO DE ACERO)
Caliber 7.62 N.A.T.O.
FOR: PROTYPE RIFLE T48, HARRINGTON & RICHARDSON ARMS CO.
POR: EL FUSIL FABRICA NATIONAL
ATLANTIS MUNITIONS CORP.
On the side reads: “Caliber 7.62 N.A.T.O.” with a rubber stamp “REPACKED APR 15 1960” or “REPACKED FEB 10 1961” (more dates may exist)
I couldn’t find anything on “Atlantis Munitions Corp”, if this firm actually existed. We may think this was done for an Spanish speaking country, but who was testing the H&R T48 rifles in 1960-61? Text “EL FUSIL FABRICA NATIONAL” makes no sense in Spanish but could be a wrong translation for “Fabrique National d’Armes [de Guerre, Herstal]” and the word “PROTYPE” for “PROTOTYPE” may indicate that this label wasn’t made by an English speaker either. Anyone knows if the remaining T48 rifles illustrated in H&R commercial brochures were available on the civilian market? Where are these rifles, except for museums?
Another interesting fact is that rounds inside the 1960 dated box are reformed .30 Model 1906 cases headstamped S L 43. Confusing, isn’t it?