Well 1975 was a strongish vintage (Parker gave it an 85) for Tuscany.
Ruffino is a huge producer whose ordinary wine is pretty average but whose tops wines can often be quite smart. And as they were one of the first commercially driven houses to turn from producing bulk crap and focus on producing individual wines from the region that bodes well.
I would give it ago. I have never heard of the Magnifico label- it may have some special commemorative value and consequently may be a special bottling.