71  (Early Series; PPP?)   Open bowl?
No numbered example is recorded. Known only from this shape-book entry which has no sketch. The dimensions suggest an open pot or bowl.
Does this shape appear in other series?   Can't tell.
Other entries in the same very early shape book are recorded mostly as PPP.

Dimensions; from shape book, height about 6 cm, diameter about 13 cm..

Shape book 'PPP'
A possible candidate for Early Series 71?  Its dimensions match.
Height;  5.5 cm.
Un-numbered, base stamped PPP.

Collection; 'W'.

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