Get some Renaissance Wax, Larry/BF. It will help preserve the leather and the metal.
"Renaissance wax is used by the British Museum & restoration specialists internationally to revive and protect valuable furniture, leather, paintings, metals, marble, ivory etc."
My jar of it is 200ml/7 fl oz. I've been using it for over a decade.
Do a search online for where to buy it. (~$28 + shipping)
Great stuff !! I'ved used it on power tool beds, fishing rods, fishing reels, knives, sheaths, bicycle frames and furniture.