I haven't just, recently, started collecting militataria items or 37 Pattern Webbing. Clearly your definition of an "economy 37 Pattern belt" is completely different to mine.
You are assuming that the belt has to have all of the features that you mention to make it an "economy belt" but I do not believe this to be the case and the 2nd to last example on the Karkee Web website page is a good example. It has all the features of a standard 37 Pattern belt but because it is made out of 3 short lengths of belt sown together, this is what makes it one of the "economy versions", i.e. more than one version of the "economy belt" with differing features.