I can't be certain what others mean by "mustache note" (nor whether it really depends upon a mustache), but what I mean is that, for an hour or more after smoking, I can exhale from my mouth up through my mustache (by protruding my lower lip until it meets the bottom of my mustache, forcing the exhalation through the hairs) and breathe this in through my nose, and thereby smell/taste a note that is related to but distinct from what I tasted while smoking.
For me, this is one of the distinct enjoyments of pipe tobacco. This mutache note is a pleasure.
As of last night, I've decided that my favorite mustache note is from Dunhill Dark Flake.
And here's the interesting disparity:
Although Dark Flake is among my favorite tobaccos, it is not my absolute single favorite, and yet it does leave my absolute single favorite mustache note.
Salty Dogs I like a tad better than Dark Flake, while smoking, but I like it's mustache note a tad less.
Have you noticed a certain tobacco leaving an especially tasty mustache note?
Have you noticed a mustache note ranking more highly for you than the tobacco itself does?