Bonnie Brier is a trademark of Finsbury Products, Inc. of Elmsford, NY.. The trademark was registered in November of 1976, and expired in August of 1997. The pipes are signed "Bonnie Briar" in script with the name of the model line underneath and "Imported Briar" below. There are several model lines with different makers marks on the stem or shank: Matterhorn (a crown), Standard, Highlands (script "H"), Interlude (stylized "JB" in an oval) and Willow Ridge (script "W R").
(src: www.trademarkia.com, www.pipephil.eu)