cf. for other examples and a description on the series, Howard & Ayers, China for the West, Vol.1 op. cit. pp.214-215: Two similar dishes in the Metropolitan Museum, New York, are numbered on the reverse 13 and 21. It is by no means certain that all this series is concerned with tea, for 13 shows two men making canisters from metal (possible for tea) and 21 shows the packing of a substance which may be ginger. (Elihu Yale wrote to Joshua Edisburg at Erthing in 1682, of jars of mango atchar: 'I begg you and your good Ladys acceptance of part in once of the vessels fil'd with our best mango atchat.') On 21 the substance does not appear to be in leaf form but to consist of rounded fruits. The numbers 21 and 23 lend support to the this theory, because one would otherwise expect the process on 21 to come after that shown on 23. Two plates, nos. 11&12, and a tureen (no.19) overdecorated in red in Holland are also known."
Other examples from the same series: two plates, no. 11 (carrying boxes) and no. 12 (cultivating tea) now Museum of the American China Trade, Milton Massachusetts, tureen no. 19, overdecorated in red in Holland, ibid; dishes numbered 13 and 21, Metropolitan Museum of Art, New York (Le Corbeiller, Cat 42) tureen, dish and sauce-boat, Fries Museum, Leeuwarden (De Chinese porseleinkast, Amsterdam 1968/9, Cat 274).