I do not know what its function is. The chain tested for silver.
Lettering on the side of the coin: GOD ZIJ MET ONS. A genuine Dutch Chinese Peranakan circa 85 year old solid silver belt. PROVENANCE: Property of a family from Malaysia. DIMENSION: 90cm (35) long approx. CONDITION: Good condition, no damage, no repairs.We only sell genuine vintage and antiques. The item "Dutch East Indies Straits Chinese Peranakan SILVER Coin Chain Belt Wilhelmina" is in sale since Thursday, February 13, 2020. This item is in the category "Antiques\Asian/Oriental Antiques\South-East Asian". The seller is "regencysilver" and is located in London. This item can be shipped worldwide.