In a way this is filed in my mind along with NDE and OOB claims. And indeed the belief that one is getting messages from God, or in some cases, space aliens.
I read some of these history flashback stories (and how much they reminded me of alien abduction claims recalled by hypnotic regression) and there was frustratingly little to go on to check the factuality. One memorable memory was of a revenue man in Charles II's time looking out for smugglers. It seemed unlikely, since smuggling was more a result of the blockade in the Napoleonic wars and the problem in Stuart times was piracy. But this objection was brushed aside rather.
There was also a recall of a seaman moaning about his superior who didn't dare give him a hard time because he could 'lay a gun'. He lost his leg on the 'Aggie' (Aggamemnon? One of Nelson's commands 1) when a French ship broke the blockade. Again, nothing really that one could chec, though I imagine the log of the Agamemnon would show whether a gun -captain lost a leg in such an action.
I'm reminded also of Rosemary Brown who produced some convincing Spirit Dictated compositions from Beethoven, Brahms and others (2) and her Brahms quartet -fragment sounded very convincing. But nothing that couldn't be accounted for by someone with a bit of familiarity being inventive, perhaps really believing it, or wanting to.
After all of this and much more, we still have no convincing evidence and yet another tranche of afterlife (or previous life) Proof that is all the rage.
(1)
http://en.wikipedia.org/wiki/HMS_Agamemnon_%281781%29
Meditteranean rather than blockade duty; a slight doubt. This was the earliest of the name and the only one where a gunner could feasibly lose a leg in an action against the French.
(2) can't find the Brahms but this dictated composition by the spirit Liszt is appropriate. (may need to boost the sound a bit)
https://www.youtube.com/watch?v=mdPQj4pXovQ