Initially, made from over century-old briar burls, classified by a "B" (denoted highest quality pipe); "DR" (denoted straight-grained) and an "A" (denoted first quality), until early 1915. After that, they became a high-end subset to the Dunhill 'Bruyere'. The DR and B pipes, a limited production, they should be distinguished as hand-cut in London from burls as opposed to the Bruyere line which was generally finished from French turned bowls until 1917, when the Calabrian briar started to be used, but not completely. Only in 1920 Dunhill took the final step in its pipe making operation and began sourcing and cutting all of its own bowls, proudly announcing thereafter that "no French briar was employed".
Bruyere pipes were usually made using Calabrian briar, a very dense and hardy briar that has a modest grain but does very well with the deep red stain.
"Before the 1950s, there were three possible finishes for Dunhill pipes. The Bruyere was a smooth finish with a deep red stain, obtained through two coats, a brown understain followed by a deep red. The Shell finish was the original sandblast with a near-black stain (though the degree to which it is truly black has varied over the years). Lastly, the Root finish was smooth also but with a light brown finish. Early Dunhill used different briars with different stains, resulting in more distinct and identifiable creations... Over the years, to these traditional styles were added four new finishes: Cumberland, Dress, Chestnut and Amber Root, plus some now-defunct finishes, such as County, Russet and Red Bark."