The flag of Sikkim consists of a Buddhist khorlo prayer wheel with the gankyil as the central element.
Until 1967, the previous flag showed a very complex design with a fanciful border and religious pictograms surrounding the khorlo.
A more simple design was adopted in 1967 because of the difficulty in duplication of the complex flag. The border became solid red, the pictograms were removed and the wheel was redesigned.
With the annexation of Kingdom of Sikkim to India and with the abolition of the monarchy, the flag lost its official status.
Reconstruction of the Sikkimese royal flag from 1877 to 1975
Reconstruction of the Sikkimese flag from 1877 to 1914 and from 1962 to 1967
Reconstruction of the Sikkimese flag from 1914 to 1962