13  (Early Series; PPP)   Slender jug, bulbous at base, narrowing upward  with flared lip.

Does this shape appear in other series?   No - (none recorded in image database).
Two numbered sizes are recorded, the smaller incised 13/5 or just just 13, the larger 13/7. Other sizes are also recorded, but un-numbered.

Bases stamped PPP, incised 13.

Collectors Path Pottery
Un-numbered, stamped PPP.

Leonard Joel
Height; 23.5 cm
No base markings
Long Gone Antiques, Warrnambool, Vic.
Height 24.5 cm
No base markings
13 B  (Early Series)   Lampstand, wide flaring base, with animal decoration

Does this shape appear in other series?   No - (none recorded).
Two sizes are recorded, with suffixes s and L.
These may have been intended for use either as candlesticks or as lamp bases. Note the hole for an electric cord. For another such dual-purpose piece see Early Series 157.

It is not clear whether 13 is a re-allocation of an Early Series number that became vacant when the PPP name ceased in 1934, or is part of a separate little 'Animal' numbering series. It is one of a series of animal-decorated shapes that all feature a wide flaring foot and become narrower upwards.  See Early Series 4  ; 5  ; 7 ; 9 .  
Koalas attributed to John Castle-Harris.

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Jem Antiques,  WA
13 LB
       Height; 19.7 cm.

Un-numbered, shape somewhat different. Height; 13.5 cm.
Allan & Myrtle James Collection
Youngs Auctions -
The Berry Collection
Un-numbered, stamped PPP.

13  (Early Series)     TWO SHAPES
: The second no.13 shape may be a re-allocation of an Early Series number after it became disused with cessation of PPP production in 1934, or it may be part of a separate small 'Animal' numbering series.

13 sB
       Height; not recorded.

13 & 13/5
   Height; 12 - 12.5 cm.

   Height; 18.5 - 19.5 cm.

Collection; 'W'
Bases stamped PPP, incised 13/7.

Other sizes, un-numbered
Collection; 'W'
Comparison; 13-7 (left),
with un-numbered 13
Collection; Andrew McGowan

These three are the only examples recorded to date. The similarity of their glazes suggests that they may all be from the same batch (perhaps the only batch?)
Base stamped PPP, incised 13/5