I agree about the Quaint designation,
SP sums it up pretty well:
Dunhill "Quaints" are always interesting - unique shaping variations, often based on Dunhill's own classic designs, produced in very small batches at most, or in some cases, as a single pipe - and with no way to tell which unless you ever happen upon another example of the same shape. And since they fall outside Dunhill's traditional shape chart, for stamping they carry only the Dunhill name, a finish designation and a single digit - their Group size, making them all the more enigmatic.
This churchwarden was the most similar I could find to yours,
http://secure.smokingpipes.com/pipes/new/dunhill/moreinfo.cfm?product_id=12682
so it looks like that shape is a rare bird, to me it's got an appealing old-school look, like almost as if it's off a page from the 1927 catalog - you'll have no problem selling it!
I don't understand why these pipes don't carry a special stamp, surely they know that most Dunhill collectors
love nomenclature!
I suppose they are
enigmatic though, like SP said.
Here's another example over at Al Pascia:
http://www.alpascia.com/pipes/d/Dunhill-B007-i28260x2.html
Bear Graves also wrote this bit, which is interesting,
Dunhill's tradition of very classic shapes sometimes takes a detour. A craftsman is working on, say...a classic Group "5" bent, and a flaw is found. Chuck the whole piece? No way! Now there is an opportunity to explore, in a semi freehand manner, what shape the briar has to offer. The result is a Quaint. This Quaint has a rather novel shape (see above); the overall piece, to my mind, has a hint of Italian flair, and that extra long stem is the perfect finishing touch. I know a fair amount of collectors that have a passion for Dunhill Quaints. This, gents, is a very nice one!
My favorite quaint shape is this ugly thing:
http://www.smokingpipes.com/pipes/estate/england/moreinfo.cfm?product_id=103422
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