Indonesia
Republic 5-Piece Certified Group of Proof Coinage, 1) 500 Rupiah 1992 - PR68 Ultra Cameo NGC, KM542) 25 Rupiah 1995 - PR67 Ultra Cameo NGC, KM553) 50 Rupiah 1995 - PR67 Ultra Cameo NGC, KM524) 100 Rupiah 1995 - PR68 Ultra Cameo NGC, KM535) 1000 Rupiah 1995 - PR66 Cameo NGC, KM56All examples are unlisted in Proof condition in the Standard Catalog of World Coins and Schön and are presumed to be rare.
Estimate: 800-1000 USD