I am pretty sure that the Digital Objects we used in the aDORe repo (2003-2006) had all core characteristics of FAIR DOs, including operations and the creation of a new DO in case of meaningful changes, with standards-based access protocols to top it off, see https://arxiv.org/abs/cs/0502028v1, https://doi.org/10.1045/november2003-bekaert, and https://doi.org/10.1045/february2004-bekaert.
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arXiv.orgaDORe: a modular, standards-based Digital Object RepositoryThis paper describes the aDORe repository architecture, designed and implemented for ingesting, storing, and accessing a vast collection of Digital Objects at the Research Library of the Los Alamos National Laboratory. The aDORe architecture is highly modular and standards-based. In the architecture, the MPEG-21 Digital Item Declaration Language is used as the XML-based format to represent Digital
