The purpose of this note is to highlight some evidence of relevance to gunmoney in French correspondence of 1689-90, particularly that of Antoine de Mesmes, the Comte d’Avaux, the French ambassador to the Irish court of James II.[1] Reference is also made to correspondence held in French state, military, and naval archives, which was published in the 1980s.
Some gunmoney-related evidence in French diplomatic and military correspondence, 1689-90 – Oisín Mac Conamhna
BNS Research Blog 
Although this area of numismatics is not my period of study, I find these reports quite fascinating. All one can say is ‘What other interesting and informative French documents await the researcher?’ This author is to be congratulated on retrieving this information for future students of this unusual coinage.
Thank you Eric for your kind comment, I’m glad you found it interesting.