Short answers, pulled from the story.
The Golden Osella was first introduced at the Venice Film Festival in 1987. This award was created to honor a tradition from the 15th century when Doges of Venice distributed silver medallions to distinguished citizens.
The Golden Osella disappeared from the Venice Film Festival from 1999 to 2003 for five consecutive years. During this period, no Golden Osella was presented, although screenplay awards were still given to One Hundred Steps in 2000 and Y tu mamá también in 2001.
Studio Ghibli received the Special Golden Osella for Howl's Moving Castle in 2004. This marked the only occasion that the award was given to a production studio rather than an individual.
Three Colours: Blue and Lust, Caution stand as the only films that have won both the Golden Osella and the Golden Lion at the Venice Film Festival. These films achieved a rare double honor that has never been replicated by any other film.
The Golden Osella was last awarded at the Venice Film Festival in 2012. Starting from the following year, a screenplay award is presented in a traditional format as a metal lion, distinct from the osella.