Having a good look at the inscription "Argentina" the distance between the country name and the white horizontal bar is either large or small. All the offset-litho printings [2, 4, 8, 10p and 2, 4, 8, 10, 20p with S.O.] have the larger distance. The typography stamps of the 8, 10 and 20p also have the larger distance.

Just an aside that I have mentioned in another thread: the 20p in offset-litho without the S.O. does NOT exist.
The 2p has a larger AND a smaller distance in the typography stamps:


or in detail:


the 4p in offset-litho has the larger distance, the 4p in typography has the smaller distance:


to be continued....