Addendum:
Could be that
Unit 425 Ansaldo 75mm and
Unit 423 3RO 75L46 are meant to be using the same gun?!
Though italian measurement of calibre length was somewhat different from the usual (allied) one, at least according to some sources, and in general, shorter, I doubt that the 75L46 could be the heavy 75mm Ansaldo AA/AT gun rated as L60 by the allies. But then, I wasn't able to find anything 'bout a 75/L60 AA gun, but lots of pointers to the 75/L46 AA gun?! It is somewhat suspicious, that both seem to use the Mod.34 designation ?!?!
PS: One may want to ask the folks at juniorgeneral.org what are their source for
these pics ...