I believe you take the Agito (fake) to a tekker outside the bank on the quest "Seek my master" which turns it into the Orioagito (spelling) which is the reall one. I could be thinking of something else, though.
I heard that the 1975 is the real one, apparently its the worst until it becomes orotiagio(spelling, lol) and i think any other year is a fake, like my 2001 agito.