that's from Taylor Cutlery, obviously, and was most likely made in Japan. it's not an antique, by any means, as most of them were made in the 1980's the brass handled ones are pretty rare, though, and Taylor made nice quality balisongs. you don't see them often anymore because of the ban on importing them into the US, but they're still pretty common in Asia, along with other lower quality balisongs.
i have a few Taylors in my collection, and i like them. they're not going to fetch the same price as older Pacific Cutlery/Benchmade balisongs, but i'd value that one anywhere between $40-$70, especially if it's a channel handled one as opposed to a sandwich handled one. hell, if i could afford it right now, i'd make an offer.