Does this shape appear in other series? No - (none recorded in image database) but there are other PPP flasks. The same shape appears with the addition of a spiral handle as Early Series / PPP 76, and with two spiral handles as Early Series / PPP 87.
Height; 11 - 13 cm.
Bases incised 18, stamped PPP
Long Gone Antiques & Collectables, Warrnambool Vic.