That is very cool!
It appears (at least to this newbie) that the packet kenbarnes sold could be even earlier. It bears the 1912 Patent for the first inner tube without the flange (5861/12) rather than the 1917 Patent for the inner tube with the flange (116989/17). If you look at the packet in the 1928 About Smoke, it shows the 1917 Patent.
Pipes with the 5861/12 Patent appeared until 1926 according to John Loring's charts, so it's got to be close.
It appears (at least to this newbie) that the packet kenbarnes sold could be even earlier. It bears the 1912 Patent for the first inner tube without the flange (5861/12) rather than the 1917 Patent for the inner tube with the flange (116989/17). If you look at the packet in the 1928 About Smoke, it shows the 1917 Patent.
Pipes with the 5861/12 Patent appeared until 1926 according to John Loring's charts, so it's got to be close.