The pipe is stamped with a giant C and "Not for sale" in all caps. There is also a a date stamp of 04 for 2004.
C stands for “complementary”. Pipes stamped as such are usually pipe given to business partners as a complementary present and are not for sale. That is why they are additionally stamped with NOT FOR SALE, so they are not be re-sold and marked as such.
Lightly smoked with no issues or tooth marks on the mouthpiece and bare wood showing on the bottom of the chamber. Excellent cross cut blast.
Although not necessarily rare, these pipes don't come on the market often and represents something cool and interesting in Dunhill nomenclature.