At present there is no official flag of Sikkim, a state in India. The independent Kingdom of Sikkim did have a national flag until it became a state of India in 1975.
Prior to 1877
before 1877, during the Nepalese-Bhutanese suzerainty and as a protectorate of Tibet, several Nepalese, Bhutanese and Tibetan banners were flown in Sikkim until 1816, when the United Kingdom took control of the country and flown the Union Jack until 1877, when the first Sikkimese flag was adopted.
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.