This is the first major work to attempt a comprehensive survey of the Arab-Sasanian silver coinage since Walker’s 1941 Catalogue of the British Museum collection. Since then the number of recorded coins in the series has increased dramatically and the history of early Islam has been studied intensively. The book discusses the latest research on the subject, both historical (chapters 1 to 4) and numismatic (chapter 5 to 15). All the coins (over 1,600), both silver drachms and copper fulus, in the Johnson collection are illustrated on the excellent plates. Where the Johnson collection does not have a specimen of an important coin an example is illustrated from another source, making this a truly important work. The extensive chapters on the persons named on the coins, the mints, and the Pahlavi, Arabic and Sogdian legends, make this an invaluable historical source. Other chapters discuss the copper issues with their varied designs, the eras and dates used, metrology, coins struck in the east in Sīstān and further north by the Hephthalites, and countermarks, as well as the designs found on the silver drachms. All Pahlavi and Arabic legends (mints, persons named, religious and other marginal legends, dates) are written out as they appear on the coins in extensive tables. This makes it possible for a beginner in the series to read these sometimes difficult legends.