Herrli, Hans, The Coins of the Sikhs (1st edition), Nagpur 1993, by the Indian Coin Society, 255 pages, handbound, the first major and easy-to-use catalog of the entire regime of Sikh coinage, each type illustrated by hand-drawn images. Organized by mint, then divided between precious metals and copper coinage., ex Ajit Singh Collection.
Estimate: 20-30 USD