Copperlock
Case XX CopperLock and Mini CopperLock lockbacks mix Trapper and Copperhead lines with a secure lock. Pigeon Roost Knives lists current Amber Bone, Pocket Worn Gray Bone, and SparXX Mini CopperLocks.
These are new Bradford-made knives. Compare closed length with Cheetah Cub if you want a smaller lockback for the pocket.