Local minting of silver coins in the standard of Cooch Behar
around 1909
Issuance of Bhutanese copper coins by the Calcutta Mint
around 1929
Issuance of Bhutanese silver and copper coins by the Calcutta Mint: - Silver coin without denomination, called "Che Tam" (= half coin, referring to the Cooch Behar ½ Rupees), probably corresponding to a ½ Indian Rupee - Copper coin without denomination, called "Zang Tam" (= valid coin), probably corresponding to 1 Indian Paisa (1⁄64 Rupee)
around 1950
Issuance of Bhutanese nickel and bronze coins by the Calcutta Mint, probably corresponding to a ½ Indian Rupee and 1 Paisa
around 1966
Issuance of Bhutanese commemorative coins, denominated in Indian Rupees and "Ser Tam" (= gold coin) of 100 Indian Rupees
Time Period: 1974-
Currency: Bhutanese Ngultrum
Transition
1 : 1 Indian Rupee
Sub-units
Ngultrum / 100 Chetrum
ISO4217
BTN
Timeline
06.04.1974
Start of issuance of Bhutanese paper money and coins by the Ministry of Finance; the Indian currency remained in circulation
04.08.1982
Law on the establishment of the Royal Monetary Authority; effective upon constitution of the authority on 01.11.1983