Regarding that particular example, I was uncertain as to whether it was a lick or deceptive - as you can see from my comments at the time, and I'm really no wiser now. It's entire construction is very much on the thick side and the bowl capacity is certainly small, both of which could qualify it for a lick, but the single most damning feature against that is the internal bowl shape - it lacks that one feature, common to licks, of having an almost flat bottom to the inside of the bowl. Think I'm coming round more to seeing it as a deception glass rather than a lick, but who knows.
There is a lack of adequate information and pix in the books - just odd bits and pieces - so not always possible to be certain - but it's that bowl shape that may be the deciding factor.
A recently acquired piece that has all the features of a 'lick', is shown as per the attached picture. This is a pressed piece with two mould seams - a typical flat bottom to the inside to the bowl, half of which is composed of glass (another feature of licks).
It appears unusual (in comparison with others shown in the link) insofar as it has a knop - it's also noticeably taller (little over 4" - 105 mm) than all the other examples in those original pix. My thoughts are that it's possibly an example from late in the lick era - it has a look of refined utility - and might be from the post 14/18 war time - but this is just my opinion. There is a fair amount of wear to the underside of the foot.
As to its origin, I've not a clue - unless someone can offer suggestions - whether licks 'travel', like much other glass, I'm not sure - it's tempting to think not since presumably they aren't items of personal possession - in theory they remain with the ice cream seller. This one has a slightly yellow cast - might this indicate Continental origin??
One correction to my original post in the link, concerns that dreaded error - the gadget mark. The marks referred to on the underside of the feet of some of those licks were NOT from the gadget - but should correctly have been referred to as shears marks.