Definitely uncommon.
don't use it until it receives a complete service.
if you are near your father's height, make the minor fit adjustments and ride it.

yes, you could sell it off for a handsome sum, but then it's gone.

Cinelli was on a street named Monza at one point, maybe still are? The Monza auto race track is not too far from there also.

that's all I can provide as a tie in.

if you do not have the proper tools to do the work, seek out experienced vintage aware help. ( grey haired mechanics in other words )
I would hesitate in this case a bike co-op.