Second on the list of mysteries that the first year or so of the Cwm Library project is what appears to be a shelf mark, or listing reference of some sort
The letters JR (or possibly FR) appear on six books, printed between 1564 and 1606, again in a variety of places in mainland Europe such as Leiden, Lyon, Paris, Antwerp and Cologne.
Interestingly, only a few examples of this inscription survive, all written in the same hand, and examples found so far are:
JR10, JR16, JR36, JR55, JR58, JR68
The sequential nature of these inscriptions suggests that initially, there may have been more books with this same inscription, hopefully some that still survive in other collections or libraries! The initials could represent an individual, or an institution, or a motto or phrase: who knows!
Any information that can be provided on these inscriptions could help with developing our understanding of the Cwm library and how it was formed in the first place