A53  ('A' Series / Kerryl)    Trough vase - "Window box".
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Does this shape appear in other series?  No.

Dimensions; Length 25 cm, height 8cm, width 8.5 cm.
Shape book 'A' (back)
Collection; Chris Dean
Allan & Myrtle James Collection
A planter-box version of the same shape, with two round perforations in the base.
Un-numbered, base incised Kerryl
Collection; Stan & Maria Koba
Robert Bridgman