Short answers, pulled from the story.
Pottery was produced in enormous quantities in ancient Rome mostly for utilitarian purposes. Most wares were widely distributed and produced on an industrial scale with kilns that could fire up to 40,000 pieces at a time.
Arretine ware made at Arezzo in Tuscany was the pre-eminent type of fine pottery in the 1st century BC and early 1st century AD. It was succeeded by samian ware manufactured in a number of centers in Gaul modern France and Germany.
It has been calculated that while a ship could accommodate approximately 4,500 Dressel 1 it was possible to fit 6,000 Dressel 2 4 in the same space. This advantage came from the Dressel 2 4 type being lighter and having thinner walls than the earlier thick-walled Dressel 1.
The range of decoration included pagan deities myths legends genre scenes animals hunting public entertainments such as gladiatorial combat and chariot-racing erotic encounters and in late-Roman times some Christian symbolism. One well-known name is that of Fortis and his products were evidently copied outside his own workshop in Italy.
Spanish amphorae became particularly popular thanks to a flourishing production phase in the late Republican times. The Baetica and Tarraconensis regions south-western and eastern Spain were the main production areas between the 2nd and the 1st century BC.