I googled Ron Carlos 151 and found it for sale at several US retailers in the $15-20 range for a one liter bottle. Also have a gold and a white rum under the Ron Carlos label. Could not find any reviews, which may point to it being nothing special.
Aldov, you didn't peel off the sticker on the bottle to find out the colour of the rum inside did you? lol, I'm kidding.
It's the first time I see a 151proof and it clearly says "Caution flammable" wow!! well you got them for free. Here's hoping that the previous occupant of your apartment wasn't wanted by the cops for vandalism.. if so.. might as well dump the evidence in the sink as soon as you can before they come knocking at your door! if not let us know how it tastes lol.
Seriously thanks I always like to look at bottle pictures.