Herrli, Hans, The Coins of the Sikhs (First Edition), Nagpur 1993, by the Indian Coin Society, 255 pages, hardcover, with virtually every coin illustrated by hand, a comprehensive catalog of Sikh coinage with background drawn from a thorough survey of the literature; scholarly yet very collector-friendly. The type/date catalogue, drawn from public and private collections, is organized by mint and includes transcriped, transliterated & translated legends (there is no 2nd edition).
Estimate: 20- 30 USD