The first picture is by me and from this meeting (see two posts back on this blog).
I have tried to copy here some sound clips of the MV4 (or 3) but it doesn't seem to work. But if you want to hear them, here is the place to go. Look for the Surtees, Hocking or Agostini entries in particular, with the MV Agusta. Lots of other joyful sounds here too.
And here are a couple more pictures of one of these machines (a more recent one judging by the disc brakes on the front and the wheels), this time by Phil Aynsley, and one of them with Giacomo Agostini on board.