Prefix *201* means it is a Gilera 175/202 Super, built between 1963 and 1970.
This model was introduced as the 175 Super but it already had 202cc displacement.
After one year of production the model was renamed as Gilera 202 Super.
The louvred left hand cover means this is a European built Gilera.
The Argentinian version (like the 200GT) had louvres on the right hand cover.
The front fork, front wheel, seat and fenders are incorrect.
The red bike is a Gilera model named 150 Autostrada but it actually has 175cc displacement.
This is a late version with a 5 speed gearbox, great for touring on the Autostrada (hence the name).
PVU means Polizia Vigili Urbani, this was a production series that was sold to the local police.
The seat, exhaust and carburettor are not original.