Joined: Jan 2010
Posts: 9,830
Likes: 1,807
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Better eyes than mine have weighed in here.
I was thinking this was a much older bike with later decals applied, but it seems that actually this is just an alternate-factory Bianchi peculiarity from whatever date you'll find stamped somewhere on both front and rear derailers. Date format will be XX/XX, stamped in tiny, bold font.
It's a cool bike, imo best kept as original as is practical for your intended usage.