I refurbished (I can't really say 'restored') my father's 70s Legnano five-speed roadster bike and it rides pretty wonderfully.
THIS is the model (but in lime green).
That said, some of the original parts went missing, including its original seatpost binder bolt!
I found a closeup of it from a different Legnano HERE.
I desperately need to procure it as the seat continually swivels as I'm riding it.
Any help as to where I can find this completely unique and difficult-to-find part would be MUCH appreciated! I really, truly will be forever indebted! I've looked on ebay and ebay.it numerous times and haven't found a thing...