Quite right: only vases marked with 'Celery' can be called as such. Keith, see Chance Expressions, p.15
I have also discovered paperwork about a new pressed-glass range made by Chance c.1950 where a vase was refused the 'Celery' tag by HM Customs because of its rather elaborate decoration. HM Customs preferred to see plain utilitarian glassware that wouldn't get sold as a flower vase, which would have attracted a higher rate of Purchase Tax! See Chance Additions, once it's printed (now just finalising the copy editing, with thanks to Christine).