This is authentic and it's from the turn of the century.Early to mid 90'sI have never seen a manufacturer tag for Zegna like that, but based on the label it could be that old. I have 0 experience with that one.
Armani Jeans will use the eagle as well, sorry for the confusion there (i'm not as familiar with that nor Armani Exchange). But 'Giorgio Armani' does not use the eagle. Any logo that says Giorgio Armani and uses the eagle is fake as hell.
[[SPOILER]] Faaaaaaaaaaaaaaaaaaaaaaaaake. Giorgio Armani logo doesn't use the Eagle, only the diffusion line Emporio Armani does. Jackets like that would unlikely be released under black label, more likely A/X, Jeans, Emporio or maybe Collezioni. Very fake, do not buy.