Sample X Foursquare - 13YO, 59.8%

Foursquare

Type - Single Cask Rum
Age - 13YO
Strength - 59.8% vol.
Content - 700ml
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Like many rum distilleries, Foursquare was once a sugar factory, rebuilt as a rum distillery after 1996.
Many rum producers eventually add sugar for adjustment, and Foursquare is one of the distilleries that insists on not adding sugar.

Sample X is an IB series.
Currently observed, Sample X seems to focus on non-blending.
There is also a series called Sample Eleven that focuses on blended rum.