I did a fair amount of researching this period, back in the mid-80s, when I was shooting flintlocks with a bunch of "buckskinners". I'd guess that you're definately right in your criteria. I've had the River's in Grenada (it's definately an acquired taste, very popular with the locals, but pretty vile to me!); and it would be "authentic". Another one that you might be more able to find is the White Star Rum from New Brunswick. Never had it, but, from what I understand, it's an over-proof that's made in Trinidad and bottled in N.B If so, it's probably the same stuff that's made by Trinidad Distilleries, Ltd. and sold in Grenada/Carriacou as "Jack Iron", which I've had downisland many times. Want to have some fun? Con an unsuspecting soul into doing shots!