If I got you well, this watch was bought in the Navy Stores by the Argentinian Navy?
Is the date in Japanese? ( The day, not the date, sorry ).
Do you have the meanings of these 5 figures?
Aaah, and as per the Argentinian Tudors, what references does your friend have? Don't tell me 7924!!!! Please, no!!!
Congratulations, my friend, on an interesting find!
Un abrazo.
Nicolas