First, I was travelling through Kentucky and had a spare moment to pick up a couple of bottles, one of which was Rittenhouse Rye, which I've heard a lot about. The label states distilled by "DSP KY 354" What does that signify?

Also, because I live in Minnesota, I've only seen Heaven Hill bottled in bond with a gold and black label. While in Kentucky, I saw a white label; green label and a black label, and it seemed, a couple of other label variations. What are the differences?