A picture of the flag from Sotheby's auction:
कौमारी Kaumarī the power of Kārtikeya, the commander-in-chief of the devas is also on the flags, as is वाराही Vārāhī, the power of Varāha, the boar-headed form of Vishnu.
Kaumari rides peacock, holds spear etc.
Maharaja Sher Singh 1842, by Alexis Soltykoff, British Library