They were a special import by Epaulet in 2014 - I found what they had to say about them originally thanks to the Internet Archive:
Crafted in England by NPS Solovair, the balmoral Country brogue is made in a soft off-white nubuck leather. It has large and bold punches and metal eyelets. The upper is goodyear welted to an authentic "sole-of-air" sole. As a goodyear welted style, this boot can be resoled when needed. The PVC sole is heat-sealed and air-cushioned, and produced to Dr. Maerten's original 1950's specs. A full leather footbed provides excellent comfort and breathability, and these shoes are 100% produced in the United Kingdom from start to finish. "
Size 11 UK, 12 US. I measure a US 12E on the Brannock device, and these fit me perfectly.