2018 edition. 70% rum 30% first fill bourbon. 3,700 bottles. 46%. Color - cause you know it's a 21 springbank and they change the casks annually and don't color, it's a really rich gold/straw color. This looks HEAVILY first fill so I'm thinking a good portion of this was "fresh rum" as springbank calls it, but having a 19 year single cask fresh rum at cask strength this is darker so the bourbon has to be the driver of the color. Either way, I think we're getting fresher and younger casks than a lot of whiskies on the market and than say the recent 12 year batches which seem less and less enjoyable. Nose - salted vanilla, fresh oak, cooked vegetables, citrus fruits. The drivers are mostly the oak and the vanilla and salt. Really good nose for these casks but not exactly my favorite profile either. Taste - this is heavily distillate forward, really giving you the springbank malt with the casks just added sweetness to it. Salty, peat is pretty forward here (didn't get it on the nose), a bit vegetably (is that word?), a bit sour and bitter, and certainly some vanilla but it is not forward. The whisky then goes into this fruity and slightly bitter finish that lingers for days it feels like. There's oak and fruits and light spice. One of the absolute best finishes I've ever had in a scotch, especially a non wine cask influences or bourbon one. I do wish it had a bit more sweetness to balance with the bitter notes. I think that's where the sherry casks work best with springbank or perhaps even port. I think pure bourbon and/or rum are a bit too simple for the overpowering springbank malt. That said I'm a bit nitpicking and at 400+ a bottle please allow me to be a picky bastard. Still this is one of the best 21 year old scotches I've had, it's not my ideal profile as I tend to like heavy sherry or other wines and/or heavy peat more (even at this age I'm a peat man). That said this is already a very special bottle in my collection but I have a feeling if I ever see it the 2019 bottling will be more my wheel house. 4 stars but for the price you either need to be a springbank lover (me) or a huge fan of spirit forward older whisky.