A3  ('A' Series / Kerryl)    Beaker.
Does this shape appear in other series?  Yes -  Later Series 79

This shape number is amongst those listed on a surviving price-list that is dated October 1952. In 1952 the Remued Later Series was still in production and would continue for another four years alongside the 'A' Series.

Height; 10 - 11 cm.

The lower note, apparently added later, refers to a slightly smaller version named 'Special Abo beaker'.  Unknown - if 'Abo' is short  for 'Aboriginal' it presumably means decoration comprising an aboriginal figure or perhaps a 1950s version of aboriginal art.
Shape book 'A' (back)