This paper will investigate digital numismatic collections management challenges and potential solutions using the national collections at the National Museum of Finland and the Finnish Heritage Agency as a case study. Concentrating on coin finds, we will discuss digital heritage challenges that stem from combining heterogeneous older and modern catalogues and data, and in designing sustainable institutional solutions that serve the needs of multiple user audiences (e.g. collections management, scientific researchers, non-professional numismatists and the general public). We will present the new project DigiNUMA which aims to develop a new Finnish public data service for numismatic heritage through data harmonisation and Linked Open Data principles in concordance with the principles of pan-European undertakings such as Nomisma.org and AriadnePlus. The possibilities that such technological platforms offer for deploying digital citizen science/crowd-sourcing data enhancement will be discussed.