Swiss fine, rare skeletonized open faced lever Circa 1975

A fine and rare Swiss 18 carat white gold, jade and diamond set skeletonized open faced pocket watch, circa 1975. Finely chased and engraved manual winding nickel lever movement, 17 jewels, mono-metallic compensation balance. Finely chased and engraved skeletonized dial with blued steel hands. Case with diamond set inner bezel, outer octagonal jade bezel, snap on sapphire crystal back. Case, dial, and movement signed. The total diamond weight is approximately 2.6 carats.