Thanks Ivo, I've seen lots of those but hadn't found your links - lovely to see them.
I had previously found this signed one
http://www.liveauctioneers.com/item/8116303 - pertinent to me because it is very obviously from the same hand as a vase I have.
I suppose I'm curious because the signed one I've just linked to here , as well as the Sotheby's one, and the one I own, all seem to be a 'range' if you like - and they seem slightly different in the way the colours have been used, to the pieces such as on Ivo's links.
It's quite probably because they came a in a different period in Leveille's career, perhaps towards the end maybe, whereby the shapes seem somewhat 'more modern' than the era and the use of colours and they way they are applied seem a little different don't you think?
Everything about mine otherwise is 'right', the large polished pontil, the internal decoration over the crackle etc, I know I should just rest the case having found a signed piece so similar to mine - but you know how it is

edited to add
Having looked again at some more details, the vase I just linked to here
http://www.liveauctioneers.com/item/8116303and this vase here
http://www.herr-auktionen.de/kataloge/onlinekatalog/detailansicht/article/vase-5626cfc2e6/?tx_ttnews%5Byear%5D=1970&tx_ttnews%5Bmonth%5D=01&tx_ttnews%5Bday%5D=01&cHash=e4f1030b466cfe3973d55e02075b1603have both come from the same collection and both are signed - presumably the owner would have been able to check details and sigs so would I be reasonable in now laying to rest my query and putting a fairly firm id on these vases - including the one linked to first here as having been sold by Sotheby's?
If so I can do a little celebration dance

for my vase
m