:

Does this shape appear in other series?   No, not exactly, although there are other plant-pot or beaker shapes, not so tall.

It is very similar to the shape currently catalogued as Early Series 457 although that is less tall (16cm). Only a single example is recorded for both 451 and 457, and in each case the incised number is slightly unclear. Perhaps they are actually the same number, notwithstanding the size difference, either 451 or 457.  More examples are needed to resolve the question. A similar un-numbered piece is recorded with an intermediate height of 19 cm (below).

Height; 23 cm.

Un-numbered, incised Remued.

Height 19 cm.