25 Years and Counting. Case knives have always been prized for their quality and detail, but when Case introduced the Pocket Worn® finish in 1996, it raised the hand finishing process to a new level. Today your invited to celebrate the 25th anniversary of Pocket Worn® Case knives with the new Olive Green Bone series. Eight patterns make up the entire set, available individually or as a commemorative Mint Set with specially decorated handles, blade serialization and more.