Damascus Bowie Knife By Herb Derr. The 6" 2700 layer Rain Drop Derr Damascus blade is hollow ground with file work on back. The handle is made from a large piece of Stellar sea cow accented with stabilized maple burl spacer. Nickel silver guard and butt. OAL: 10.75". Perfect fit and finish knife is mint and comes with a Derr custom ostrich inlay sheath.