323(Early Series) Small pot with shoulder and vertical collar, no flare, with twig-handle.
Does this shape appear in other series? Yes, more or less. It is like 500 Series 503 and Later Series 11, and also in the Early Series 322. Unlike the others, however, 323 has a twig-handle (at least in both the two examples yet recorded).
In Remued shape-numbering it is most unusual for a twig-handle version to have a separate number of its own, as appears to be the case here. Normally the same number is used whether a piece has a twig-handle or not, although similar anomalies do exist with Early Series 220 and Early Series 221