An example of an extremely rare Lombard object is this great concealment, found in the castle of Calchis in Euboea. Luigi Marzoli disputed the purchase with the Metropolitan Museum of Art in New York, where all the other Calchis finds are kept. This piece testifies to a particular moment of Lombard production, probably Milanese, as suggested by the crowned P mark, similar to the one found on the oldest surviving plate armor, preserved in Castel Coira and on a basin found in a well in the Palazzo Comunale di San Gimignano, traditionally attributed to Pietro Missaglia. This type of helmets, which represents an involution in the manufacture of helmets compared to contemporary specimens, was intended for the Venetian market to arm their men-at-arms also in service, as in this case, in the overseas territories.