There have been many of
these vases, all labelled and signed fairly convincingly, on eBay.com.au over the last year or so. It was the volume that suddenly appeared about a year ago that seemed odd, but I wasn't certain.
Maybe it's just the photos, but on mine, most obviously there are more stripes which are more colourful, whereas the ebay vases always seem to have not so many. The cloudy white layer seems to be more opaque, too. Mine has a plastic BODA label, their's is paper, but does that mean anything?
What do you think? Is it just that mine is a particularly good example, or could someone be counterfeiting these? (Or, I don't know. Maybe mine, bought 10 years ago or so, is fake?) Excuse the photos. I couldn't get a good photograph of the signature (well, to be honest I couldn't be bothered dragging out the lights and all...

)