Hi HMac
Thank you very much for your reply. I have no names of any potential vessels covering his service in the Mercantile Marine Reserve (specifically in 1918) although I do have the names of the following ships; the Greta, the Thistle and the Rosaleen, all listed in 1915 on the National Archive records, which show my great-uncle on their crew lists.
His name was Mark Kearney, born c. 1895/6 in Dublin. But I think these are just regular Irish merchant navy ships before he joined the MMR.
Mark's MMR service record number on the 1926 Admiralty medal-award letter is 924086. (His regular Irish Merchant Navy number post-WW1 is 422907.)
If it's convenient and you are in a position to have a look for vessels on any other record databases that you're aware of, that would be most appreciated.
Many thanks once again,
Runner55