The original standard of the Prophet

The original standard of the Prophet

One rare banner preserved in the Topkapi Saray Museum at Istanbul, called as-Sinjaqu 'sh-Sharif, is said to be a most sacred emblem. It is the original standard of the Prophet. It is made of four layers of silk, the top-most of which is green, those below being composed of cloth, embroidered with gold. Its entire length is twelve feet.

Source: 
Book: Ismaili flag - It's Origin & Importance