Home Features Warwick Unveils Masterbuilt Thumb NT LTD and Teambuilt Thumb BO LTD Models Warwick Unveils Masterbuilt Thumb NT LTD and Teambuilt Thumb BO LTD Models planetsixstring July 20, 2017 comments off Tweet on Twitter Share on Facebook Google+ Pinterest The company is celebrating its 35th anniversary with the release of a pair of limited-edition designs.