Our pipes seem to be related. I read that CPF was acquired by KB&B before the turn of the 20th century. My Selkirk has the CPF logo with "Chesterfield" underneath on the stem. Most articles I've read say that CPF stands for Colossus Pipe Factory, but I wonder if the word "Chesterfield" here casts some doubt on that?I have a rather large C.P.F. briar churchwarden, I don't know exactly how old it is, but C.P.F. went out of business between 1910 and 1915 according to my Lopes book. So this pipe is at least 100 years old and it still smokes wonderfully.