Very strange indeed. Not sure what the purpose was supposed to have been. Medical/dental assitance in some way? Adjustable smoke stream? Simply a gag?
http://www.ebay.com/itm/262799852897
I found the brochure on the Japanese "Ye Olde Briars" site and used in in my Pipedia Barling article. Barling designed and patented a number of specialty bits. Here's a page of bit designs: