Agip were the official oil supplier at the time of the SP4, as Shell are nowadays.
Other than the sticker near the oil filler, i don't think any agip stickers were standard fitment to any of the models of that era? although many bikes have had them stuck on. It's just so "italian"...................
The Agip logo is one of motorsports all time classics. Still looks good and most people with half a clue about bikes/motorsport will associate the decal/logo with the Agip brand.
If you need a couple, mail me