This work, the first in a series of 5 volumes devoted to the sestertius of the Antonines, covers the reigns of Nerva and Trajan. Intended for both amateurs and professionals, it is designed as a practical tool to facilitate the recognition of these currencies. Indeed, it is not a classic catalog or a historical and chronological study, but a key allowing the very rapid and sure identification of these sestertius. Contrary to the method usually used in numismatics, this key, of new conception, begins with the precise study of the obverse and leads to its coding. To this obverse code will then be added and merged one or more reverse codes. For each type of sestertius, the reference works are cited, followed by an inventory of their presence in most world sales over the past 12 years, allowing the reader to better appreciate their degree of rarity. This key is illustrated by more than 180 obverse and reverse photographs. At a very affordable price of 35 euros !
