If you got it in the 90s, a good chance it is a late 70s or 80s Hattori, collectible enough that folk reliving youth pay $300 for modern Hattoris in limited runs. That firm also did the higher regarded Beretta and Browning knives. If yours is serialized, this article suggests it a post-Hattori blade, but you can compare what you have to this article.I'll have to dig it out and see what the markings say. I got it as a kid in the 90s, and who knows how long the neighbor had it. He was an old man at the time.