Its a Mazzer (obviously) doserless grinder roughly equivalent to Super Jolly. Mestre is a district of Venice where Mazzer must once have been based.
Id say made in the late 60s but Im guessing. It will be a 64mm flat burr.
Its not the original hopper (would have been glass), making it practically useless as a collectible I would have thought. Still cool though. Expect to pay an arm and a leg to have it shipped!