That's definitely Brioni, so congrats. Brioni is definitely one of the premier makers in the world. It doesn't get a whole lot better than finding one on accident for $4. As far as age, it looks a little bit older, but not that old. The two button sleeves were more popular in the 90s I think, and that fabric tag isn't used anymore. How many vents are on it? If its side vented, then its an amazing find and who cares how old it is, but unvented jackets are definitely less popular now. Either way its a great find. Keep on listening to that spidey sense! EDIT: Oh and make sure to look at the back of the buttons for markings. Its happened before where a guy picked up a blazer with gold buttons. Just don't get your hopes up.