Thanks, Martin, I know of all the Troy prints but, when I wrote above, didn't have time to check my full records. These are in the various appendices of my 2006 thesis - The Printed Ballad in Ireland: A guide to the popular printing of songs in Ireland 1760-1920. which can be downloaded: https://aran.library.nuigalway.ie/handle/10379/5020
Most important for this discussion is the Database and the lists of printers given in the section under Trade.