Subsequently silver coins of a reduced weight standard, mohars, were struck by the kings of the three Malla kingdoms which shared the Kathmandu valley.
In 1791, the Tibetan government opened a mint and started striking the so-called kong par tangkas.
The last Sino-Tibetan issues of the 19th century are dated to the 16th year of the Dao Guang era (AD 1836).
The reverse of the coins display eight auspicious symbols of the Tibetan Buddhism, which surround a lotus in the inner circle.
Most probably they were originally struck for ceremonial purposes by Nepalese who were residing in Lhasa, but eventually entered into general circulation.
The obverse of the coins show the eight auspicious symbols (Tibetan: bkra shis rtags brgad) of Tibetan Buddhism: umbrella of sovereignty, two golden fish of good fortune, amphora of ambrosia, lotus, conch shell, emblem of endless rebirth, banner of victory and wheel of empire.
Starting from the top, the legend in Tibetan on the reverse says: dga'-ldan pho-brang-phyod-las-rnam-rgyal (The Palace of Ga-den is victorious in all directions).
In the centre of the wheel two comma-shaped elements represent what the Tibetans call norbu dga’ khyil („whorling jewel of joy“).
The earliest known series of the tangka and probably also the early Sino-Tibetan coins were struck in the Lhasa mint, located in Shol, below the Potala, from 1763 onwards.
In the 20th century, four mints issued the Tibetan tangka in volume: Dodpal, Dode, Ser-Khang and Tapchi.
In 1881, an edict was issued ordering that no discrimination to be made between the fake and the genuine tangka, thus the unofficially struck coins also became the legal tender.