Am sure I've only seen Crinkles applied in an unbroken uniform sort of band appearance, on bulb vases, tumblers, water jugs plus whatever other assortment etc. - I've not yet seen anything - like the Leerdam vases in the attached link - where they've been applied to give a small almost stenciled look, so this seems to be by far the less frequent method.
The more usual application is how we see them shown in the b. & w. picture, plus the pieces decorated with bands in colour, in the link.
http://www.hogelandshoeve.nl/main295.htmlI'm confused and now really unsure as to how this biscuit barrel was decorated, but the plain glass area looks so irregular that I'm struggling to picture an old guy at his bench - sticking little bits of MC around this barrel - in random fashion - to create the gaps for the enamel painting
If anything I'm leaning toward an acid job, with resist, to provide the clear areas for painting, but in the absence of high quality close up pictures we'll probably never know. I'm also inclined IMHO to consider the barrel to pre-date MC, but who knows