The pattern is called a stockman. The covers appear to be horn. A soak in neetsfoot oil will bring back their luster. Not neetsfoot oil compound, but just neetsfoot oil.
Before you do that, run the knife under warm water with a bit of dish soap and work the blades open and shut several times to wash out any gunk. Then, blow out the knife really well with compressed air. If you're going to soak it in oil, do it now. If not, a couple drops of mineral oil in the joints and put it in your pocket!
Nice older knife.