91  (Early Series)    Bulb-shaped lamp bases, with handle.

Does this shape appear in other series?  No - (none recorded).
Separate shape books show two separate sizes; an older, larger size and a later smaller size. No numbered example is recorded for the smaller size.

Long Gone Antiques & Collectables,
Warrnambool, Vic.
Shape book 'C'

The older book (left) lists dimensions that match the examples above.

Hurnall's Antiques & Decorative Arts
Shape book 'E'
Un-numbered example.
Height 20 cm.

             Collection 'W'
Left: Probably an example of the smaller size 91.
Height 11.5 cm. Un-numbered.
Seen here with the larger size 91 (also un-numbered), height 18.5 cm.

Larger size
   Height; 17 - 19 cm. The same size and shape, but without the handle, appears as Early Series 99.

Smaller size
   Height; approx 12 cm (from shape book).
   No numbered example is recorded.