Picton Hopkins is a firm established in Richmond, Melbourne, in 1857 that continues today, making plaster products, During the Second World War and into the early 1950s, the firm made a range of slipcast tablewares, and china doll parts. The website for the firm does not mention this part of their history. The only other reference I have been able to find so far is the entry for Picton Hopking (sic) in Geoff Ford's Encyclopedia of Australian Potters' Marks, which documents the range of marks and printed labels used. A friend researching Ellis Ceramics tells me that Miloslav Kratochvil worked there for a short time in 1952.