Id help green orange glazed vase m z ?

Its appr 30 cm tall,  havy vase. Beautifully glazed amd signed but cant figure out by whom. Any help is much appreciated.

Looks like an Italian numbering system

Thank NaomiM, is there an open source where you can look up the monograms of Italian ceramists?

Not that I know of. There's Mark Hill's book, and a Bitossi website, but most of the records were lost in the late 20thC. There are a couple of Italian Ceramics groups on Facebook

thanks again. does the numbering reflect the decor name / style of the vase or tell you something about how much of a piece has been produced?

The numbering seemed to be for the benefit of the retailers or wholesalers, and doesn't seem to follow any recognisable pattern except that some factories had longer numbers than others. Bitossi, Bagni and Fratelli Fanciullacci, and a few others, had more recognisable codes than others