183  (Early Series)   Jug, bulbous base with long flaring neck.

Does this shape appear in other series?   No, not exactly, but it is quite similar to Early Series 118 / Later Series 146.

Height; 11.5 cm

   Collection; 'W'
Early Series 183 (right)
with an (un-numbered) Early Series 118-M  for comparison.
This is the only numbered 183 example to be recorded so far.
Height;  11.5 cm.

There is no sketch  in the shape book but dimensions are quoted as follows;

Shape book 'C'