Lao, Savang Vatthana, Gold Proof Set 1975 (3), Au mm 23, 18, 18, rare set, 100000 Kip (mintage only 100 pieces) in Slab NGC PF69 (best grade of NGC); 50000 Kip KM-19 (mintage 175) in Slab NGC PF69 (best grade of NGC); 50000 Kip KM-20 (mintage 175) in Slab NGC PF69 (best grade of NGC)