Hi Hoppes,
I said I'd follow up with whatever snippets I could find about the Free Bore and the 1 in 12. Unfortunately my info is fragmentary in the extreme, and amounts to this. First, the Free Bore is mentioned in trade directories of fancy goods brands for quite a while; the earliest directory I have access to that includes the Free Bore is 1921 (although clearly based on your hallmark the Free Bore dates at least to 1916), the latest mention is in 1941. The One in Twelve (as the 1 in 12 is also called) is mentioned in my copy of the 1922 trade directory of fancy goods brands, and again persists through the 1941 edition. I know the two brands vanished from trade directories by 1951, but since I don't have directories from the period immediately after the war I'm not positive when they actually disappeared. My personal guess is during the war, when pipe production of all kinds was curtailed as manufacturing capacity shifted to munitions and other war-related materiel. This guess is supported by the evidence of trade price lists, where we find the "Ben Wade '1 in 12' Silver Mounted" retailing at 10/6, appearing from 1925 (the earliest copy I have) through the beginning of the war. 10/6 put it in the top tier, price wise, in 1925 alongside the de-Luxe and the Bourchier Briars, Silver Mounted. Eventually the 1 in 12 was superseded, at least in terms of price, by the Larnix (Gold and Silver), Super Grain, Selected Grain, and Paramount. None of the price lists show a separate listing for a Free Bore.
As for the source of the Free Bore and 1 in 12 names I have little to no idea. I can tell you that a couple of trade advertisements make it clear that Ben Wade offered a cleaning tool called the Free Bore, and at least for several years in the 1930s enclosed one with every pipe they sold (for a description of the tool see: http://www.pipes.org/forums/messages/23/83485.html?1280708290). This leads me to tentatively surmise that the Free Bore was a cleaning tool, while the 1 in 12 was a higher end pipe model. Perhaps the double nomenclature indicates your 1 in 12 pipe dates from a time that co-packaging with the Free Bore tool was taking place; that's a pure guess, and personally I wouldn't bet anything either way.
I'll root around a bit more and if I find anything will let you know, but I suspect this is the crop, at least as far as what I know is concerned.
Regards,
Jon