I suspect that there are many more Dutch ships hired in 1652 and 1653 than are apparent in the literature

From what Carl Stapel is finding in his research, it seems that there were more ships hired by the Dutch in 1652 than is obvious from the published literature, particularly Vreugdenhil's list from 1938. Part of the explanation seems to be that Vreugdenhil did not make use of documents from the archives. Vreugdenhil seems to also on occasion to be mistaken about a ship in his list. Carl Stapel has made a convincing argument that ship number 8 in Vreugdenhil's list, the Engel Gabriel completed in 1636 is in fact the jacht Engel Gabriel, which was out of service before 1648.