I have several similar items - and I'm quite happy to recognise them as Aseda bamboo vases - without really wanting to find out if it is a Chinese imitation, early or late production run, or why. If they're obvious, okay - no problem, it adds to the general knowledge. But preceise height, weight, diameter tolerances or casing is a step too far. You can find out when you have a real one and a fake one next to another - and then there may be deviations.... but maybe not. And having one certified original will not always warrant that the copy is a copy - if you get my drift. So I tend to be rather brief in these discussions.... especially if it looks like the real article!