This probably Royal Amulet holder of a typical baroque style and highly influenced by a Portuguese (barroco style jewellery) pendant or necklace.
The convex gilt silver case, on the top ornaments of welded filigree with fine quality Diamond settings.
The pendent is also a reminiscent of a European pocket watch.
The Amulet was probably used to contain some protective Quranic verses or Prayers (Doaa).
For almost an identical pendent please see, SIERADEN EN LICHAAMSVERSIERING UIT INDONESIË
VOLKENKUNDIG MUSEUM NUSANTARA DELFT,JEWELRY AND BODY DECORATION FROM INDONESIA AT THE VOLKENKUNDIG MUSEUM NUSANTARA DELFT, 1984, BY Rita Wassing-Visser, Pages Lot illustrated on page 88, lot description is on page 110, Lot No. Bri.:TIM- A 1772-48
Please notice the almost identical applied leaves and the filigree silver work including the unusual double round scrolls or coils used in the decoration.