I have some allotment records for a Royal Marine ancestor in the early 19th century. It lists him under a ship name, and the date he made an allotment. What I'm wondering is: when was he on the ship? Sorry if this is a silly question, but if the records on the same document were being filled out at different times, with info being kept on the allotments payment over time, I couldn't be sure when exactly he was on the ship. For example, on one allotment record, he made the allotment in 1812. However, next to the ship name it says the ship was at Plymouth in 1815. And it says in one column "charged on pay books ending 1814". Any help would be greatly appreciated.