The one I looked at recently had S3EL stamped on the bottom of the barrels along with a normal date (a couple digits hard to read, but I think it's 1956) rather than the Italian Roman numeral date code from that era. Engraving very similar to the photos on the previous page, but with cocking indicators which I don't see on those, even when I blow up the photos.
Larry,
Beretta removed the cocking indicators around 1959. This is when they stopped using the 7-pin lock design (sometimes referred to as the H&H design) and used the Beretta improved 5/4 pin lock design.
I have a photo of a gun stamped 1950 instead of the date code. It appears Beretta used dates for some reason (just not known).
Ken
