180  (Later Series)    Bulbous vase, small collar lip.
Does this shape appear in other series? Yes -  'A' Series / Kerryl A124 according to a shape-book entry but no example is recorded.
Early Series 32 also had a similar shape but was slightly smaller.

Note the applied decoration but no 'M' suffix in the number.

Height; 12.5 cm
Shape book 'A'

The shape book is annotated "White" for this shape, and every shape in the range 175 -180.
Amongst examples in the image database, however, not every piece is white (as evidenced here) although most are.

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