Thanks for the info, pitchfork. I own a cased set of four ADP silver banded billiards with both amber and vulcanite stems. The bands are hallmarked 1907. Also, the ADP pipe plays a small part in the Sherlock Holmes' story "The Silver Blaze." i'll try to post photos of the set later. Thanks again for the information on Adolph David Posener. I've been searching for something on these pipes for years.