Freiborg and Treyer Special Brown flake. Its a beautiful dark flake with a nice thin cut. The rum is minimal.
Not a flake (plug), but Dan's Salty Dog is a very nice example of the genre. Surprisingly mild but flavorful.
For fun I will play the game of averages...
24 or so pipes in regular rotation
2 bowls a day x 365 = 730 bowls per year
so around 30 smokes go through each rotated pipe per year
Assuming I don't favor some pipes more than others (this is a bad assumption, my rotation order is not that strict...