This just arrived today - apologies for the poor photos, but I don't have access to my lights & backround, etc. at the moment.
It appears to be Jobling's 11800 Celery Vase (the pattern is an exact match to one of the marked vases in my collection and appears to be from the same mould), however, it's quite an unusual example & I've not seen another like it. The rim has been slightly flanged - not unusual in itself as I've owned other flanged versions in the past. What is odd is that firstly it isn't Uranium glass. I have about 20 other pieces of Jobling art glass in green and all others glow under blacklight. This one is a very similar colour, just maybe a little darker and very slightly bluer. I guess it's probably post-war production? Or were the moulds transferred elsewhere after Jobling closed their flint lines?
Secondly, the base is very unusual. There is a large moulded indentation in the centre of the underside. Obviously a different base-plate was used in the mould, but I'm not sure why... My first thought was it was designed so it could be broken through to give a hole for mounting on a base or as a lamp, etc. Certainly the indentation is quite deep.
The vase is also unmarked, most others I've handled have had either the Reg. No. or 'Regn. Applied For' marks to the base, but there's no mark whatsoever on this one. It's certainly an interesting piece & I'd welcome any input/ suggestions, especially as to the purpose of the base modification...
Thanks,
Steven