
Pretty much ronseal.
Sorry about crappy link but there really isn;t much that info out there.
All I could find was:
1) It's the only rum where ice sinks in it.
2) They make it using 18th centuary techniques (and buildings)
3) The strenght varies between 140-180% proof.
4) It's too flamable to be allowed on planes, you have to get slightly different version.
5) I can't find anywhere to buy it in the UK.
6) I want some
( , Mon 28 Jun 2010, 11:03, Reply)

How does that work? I always thought that that measure was out of 100 - you know, it being a percentage and all.
( , Mon 28 Jun 2010, 11:29, Reply)

as quoted in the link: "This varies though from year to year depending on how much rain has fallen on the sugar cane from which the rum is made, some years it can get up to 86% volume / 180% proof if it’s been dry."
( , Mon 28 Jun 2010, 11:44, Reply)

It's called Navy Strength, because it has to be high enough proof so that it won't comprimise the gunpowder if it gets knocked over on a ship. Nom Nom Nom
( , Mon 28 Jun 2010, 11:52, Reply)