Thank you for viewing. I received this as a gift, so I don't know the details, but I believe it's probably a Gibson. However, I'm not certain, so please make your judgment based on the photos. I believe this is a bridge from a J-45 or Hummingbird from the late 60s to early 70s transition period. The material is probably rosewood, or possibly even Brazilian rosewood. If you have any questions, please comment. I will answer to the best of my ability.