and just to add, having relooked at my pictures again mine is three colours plus clear and it also has 'CELERY' etched onto the vase.
Steven makes a comment here about the fact a vase has Celery etched onto it dating it to early post-war. http://www.glassmessages.com/index.php/topic,30793.msg167022.html#msg167022
Would it be feasible to assume having the word CELERY etched onto gives it some age and that it dates to the 40's perhaps?
Ok scrub that... having just looked it up it seems Purchase Tax was introduced in 1940 on amongst other things luxury good and abolished in 1971 when VAT was introduced. So I can assume the vase probably dates to between 1940 and 1971.