The antiquarian approach is currently very much en vogue in numismatics. However, the development of the discipline from the 16th to the 18th century can be evaluated adequately only by taking into account not just the printed works, but also the manuscript sources: mainly scholarly correspondence, but also shorter treatises or manuscripts of books that were never published. This material is scattered all over the world in archives and public as well as private libraries and is largely unknown today; hence, it is frequently overlooked by scholars.
The international project Fontes Inediti Numismaticae Antiquae (FINA) has been created in order to remedy this. It is being coordinated by the Académie royale de Belgique (Brussels; Prof. Dr. François de Callataÿ) and the Austrian Academy of Sciences (Vienna) and is under the patronage of the Union Académique Internationale (UAI). This project envisages the publication (also online) mainly of scholarly correspondences dedicated to ancient Greek and Roman numismatics, dating from c. 1500 to c. 1800: it was decided to limit the time frame to the end of the 19th century because Joseph Eckhel, the “Father of Ancient Numismatics” died in Vienna in 1798.
https://www.oeaw.ac.at/en/ancient/research/documenta-antiqua/numismatik/fontes-inediti-numismaticae-antiquae-fina/ Further information at OeAW Website]
Fontes Inediti Numismaticae Antiquae
Union Académique Internationale
Austrian Academy of Sciences