Most Barbour-branded shoes are a crock of shite these days, but they had a few models from back in the day that had those markings. Specifically, I handled a couple of pairs of veldtschoen country boots which have only ever been made by a handful of Northampton makers. I contacted Barbour, who were fairly coy but confirmed the Northants origin. For the boots, I was pretty certain that they were Tricker's although not using the standard handwritten markings. That was based on the pattern of the boot design as it was essentially using the 'super boot' pattern normally made on the 4497S last. Whoever the shoes are actually made by, the markings are the same as those boots.