From CoinFactsWiki

• PCGS 399316 - (1835-10) 1/2 Rup KM-7.2, BN
• PCGS 148100 - 1966 3 Rupee Cu-Ni
• PCGS 400061 - 1979 25 Ch KM-47a
• PCGS 164843 - 1966 Sertum Gold
• PCGS 158858 - 1970 Sertum
• PCGS 149234 - 1966 5 Sert Gold

reform coinage (starting 1974)

• Bhutan 1975 10 chetrums F.A.O.
• Bhutan 1974 20 chetrums F.A.O.
• PCGS 400059 - 1979 Ngultrum KM-49a
• PCGS 402748 - 1979 3 Ng Silver
• PCGS 168692 - 1981 200 Ng Piefort
• PCGS 400078 - 2003 250 Ng Borobudur
• PCGS 396546 - 1996 300 Ng Dragon
• PCGS 396749 - 2003 3000 Ng Buddha
• PCGS 144047 - 2000 3000 Ng Dragon