I think it's inconclusive, though intriguing. I've seen this shape on a couple of other Barlings, and it's been used on Petersons, and I first saw it on a pipe that was neither, a number of years ago.What do you think about the extension/condenser?
I go on more than a single feature, if I'm going to speculate. My first thought, when Doug asked me, was that the shaping looked promising. The tenon with extension isn't standard for Barling. It's been on less than a handful of pipes. If it was a Barling feature of the period, why isn't it on a lot of their pipes?
That I've seen this tenon extension on a few Barlings only means that its presence here doesn't exclude it possibly being a Barling.
But the waters get murkier, because besides this MARTIN pipe, another one showed up on eBay last week, with stamping for Josiah Brown Co:
1920's Josiah Brown Nottingham "Martin" Straight Grain Billiard Pipe | eBay
This one has been cleaned, stem soaked and given a polish. Whoever gets this pipe is in for a treat. It's a fine pipe. Thick chamber walls on this billiard. Stunning straight grain surrounds the bowl.
www.ebay.com
And it has the same tenon with extension, and an orific bit, AND Josiah Brown also had the MARTIN trademark, starting around 1951. That seems a bit late for an orific bit, though not to mention any construction of this type from Barling. So either Skillington allowed Josiah Brown to sell some MARTIN pipes under their own name. Brown took over control of the trademark much earlier than can currently be found in the Tobacco World Annual. Or who knows? And, of the two examples of this MARTIN pipe, both have this particular tenon extension, while with Barling there are 3 or 4 out of hundreds of surviving examples.
The data set is way too small to make any assumptions. We have two MARTIN pipes, one each from the two companies that owned the trademark, and 100% of the known examples have this tenon with extension, in other words, two out of two. How do we know that the word "MARTIN" doesn't pertain to the tenon design? Maybe the Barlings were special ordered, and had these "MARTIN" extensions made for them?
All of which shows that making assumptions may be a lot of fun, but doesn't prove anything.