Looks to be a convergence of a reddish-tinged Tanshell (I have seen a few---must be something about the wood), and the color balance being off somewhere in the digital signal chain. Together they make your pipe look exactly like an early production Redbark.
Not that it matters, of course, Dunhillers (and Barlingers and Comoy'sers) love production-related mysteries, is all. Thanks for playing. :D
It's a damn nice pipe in any event. Quite a catch. :
:
For those interested, here's Dunhill's typical/normal Tanshell shade for comparison:
.