Seaweed, thank you so much for your time & interest in finding this out for me.
Yes, I think that this record relates to my gggrandfather and that your theory is probably correct. I haven't been to TNA, Kew before but will make the trip to look at the RN records asap. I gather that the Merchant Navy was seen as a reserve of sailors for the RN.
Thanks again, Pippa
The registration of seamen was introduced under the Merchant Shipping Act, 1835, to allow the Government to
identify individual seamen able to serve as reserve sailors for the Royal Navy. To meet this need, the Registrar General of Shipping and Seamen initially compiled indexed registers of seamen from the crew lists and then issued each individual with a 'seaman's' or 'master's' ticket.
If you are going to Kew, bear in mind that your GGGrandfather may
not have served in the RN. The registrar who wrote the details on his marriage certificate, may have made the assumption that he was RN.
Seamen sometimes gave an earlier DOB so as to qualify for enhanced rates of pay
If you look at the links given by jds1949, none of them come close with date or place of birth.
All I am saying is keep an open mind.
If I were you. I would first of all check out the details of him on FindMyPast just in case you can see something I may have missed.
If they have survived. The Crew agreements of SOLENT for 1855 (the year he sailed on Her) should be in piece BT98/4244. For INDUS 1856 BT98/4588.
Central MN Personal records 1857-1913 were not kept.