Does this shape appear in other series?  Yes - Pamela 6;  500 Series 533;  Later Series 30;   'A' Series / Kerryl A65 L

Curiously, it also seems identical to another Early Series shape; Early Series 53/3. 

Of the few 220 examples recorded, all have a twig-handle, a feature rarely found in the more common 53/3.

Height; 6 - 7 cm