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Osprey apparently, from 1994 and rather nice indeed. https://www.lfgss.com/conversations/366818/?offset=100
I suppose I have a soft spot for these as I had one of the cheaper Bianchis from the same years as a kid and my dad had one of the fancier ones, SL470 I think from 1996, which is now my commuter, posted on the previous page. There was a local shop selling them and so there were lots of Bianchi MTBs about. Mine has got studded tyres on it now for the winter and the commute today in -13℃ was pleasant enough to prefer to ride to the office instead of working from home.
There's a link to a 1996 Bianchi catalogue here, there's an Osprey too: https://www.retrobike.co.uk/threads/bianchi-catalogues-from-96-98.451294/
Here is some