the larger of the two sizes of this design has projections to the base of the handles, as shown in the example here - I assume this allows the bowl to be a stand alone item, though at the time of issue there was a black plinth (catalogue 2535L) made to fit the bowl. There was a smaller plinth made specifically for the smaller bowl, plus a 2" flower block for the small bowl.
For whatever reason it seems that neither size of this bowl was Registered.
Unfortunately, the factory catalogue omits dimensions for both sizes of bowl - I have seen the jade version several times, and it's an attractive piece which glows well.
In view of Christine's id perhaps the Mods. can now move this one to British & Irish Glass.