Dewars Scratched Cask White Label Scotch was launched in 2015. It's based on their flagship White Label, which then undergoes a secondary aging in "scratched" ex-bourbon casks (scored on the inside to increase surface area, from the sound of it). According to the marketing materials, Dewar's Scratched Cask was launched to appeal to bourbon drinkers looking to transition into scotch.
Dewar's was founded by John Dewar, Sr. in 1846, later taken over by his sons, and eventually worked its through the corporate maze to become part of Bacardi. The brand was popularized in two fairly unconventional ways: Tommy Dewar, one of John's sons, was a successful travel journalist who used his platform to promote the family business, and Andrew Carnegie sort-of-famously sent a cask of Dewar's to the White House to celebrate Benjamin Harrison's inauguration in 1889. It has since become one of the best-selling blended scotch whiskies in the world.