1 don't know." People I consider to be very knowledgeable on the subject of 20th Century briar swear that, by far, the sweetest smoke comes from those Dunhill pipes bearing a patent number (pre-1955); they will not even smoke those made after 1968, believed to be of substandard quality.
The used pipe trade has followed the same trend - patent number Dunhills are commanding a higher price than those made from 1955-1968, and a still higher price than those made after 1968.
Dunhill pipe dating guide
It is interesting to note here that these first Dunhill pipes and all Dunhill pipes made through 1919 had French-turned bowls that were then finished in London by the Dunhill firm.
In 1912, Dunhill invented and patented the "inner tube", an aluminum insert designed to keep the pipe "innards" clean; in 1915, the "white spot" appeared to help the customer know which side of the hand-cut vulcanite stem should be uppermost; 1917 saw the introduction of the first Dunhill sandblast - the "shell".
I bought this book, and within 6 hours had to read it cover to cover.
Do not venture into estate-pipe collecting without first informing yourself with books like these.
You can check out more info on dating Dunhill Pipes and many other interesting articles and information at THE DUNHILL PIPE: A COMPARISON OF THEN AND NOW We are pleased to introduce R. He is regarded as an expert on Dunhill Pipes and is also knowledgeable on Castellos and other brands.