The relevance to Morini is that Jim Redman won the World 250cc championship in 1963 ( I don't know if this was the bike he did it on) and was chased all the way to the title by Provini on the Morini 250GP.
Provini won several rounds but was narrowly beaten to the championship.
The estimate for this bike is a staggering £375,000

I saw one of the 250GP bikes in Cesare Luzzi's shop in Sienna a few years ago, precariously balanced on a plank supported by two wooden boxes.