A51  ('A' Series / Kerryl)    Trough vase - "Oval window box".
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Does this shape appear in other series?  No.
A replica of Beswick design no. 1192 - see below
Dimensions; height 7 cm, length 27 cm.

Shape book 'A' (back)
Collection; Maria & Stan Koba

The original
Length 29 - 30 cm. Base impressed Beswick England 1192

As well as Kerryl, other replicas of this shape were produced in Australia by MCP (Modern Ceramic Products) in their Mingay Ware range number 294; and by another pottery (possibly Diana?) numbered T15.
There are also replicas impressed Kingsley (possibly English?)