First produced in Cuba, Matusalem now hails from the Dominican Republic (after a stint in the U.S. — presumably Puerto Rico), but claims to hold fast to its original Cuban recipe dating back to 1872.
This is the company’s top-end bottling, aged for 15 years using the solera style of barrel aging (though what exactly that means is up for debate, as you can see in the comments).
As for the rum, it’s not as dark and rich as I’d have expected from such an old spirit, its green-tinted caramel color masking a spirit that’s still got a lot of heat to it despite weighing in at just 80 proof. Less sweet than you think, its wood notes are heavy, with a touch of charcoal and even bitterness in the finish.
Otherwise this is a surprisingly, shockingly even, simple rum. Fortunately, it’s very affordable — I’ve seen it as cheap as $20 on sale — and for that, you might find it perfectly acceptable for use as an everyday mixer.