the highly organised manufacturing methods, usually using plaster (gypsum) moulds, the volume of production, and the trading and wide distribution all echo in some respects the production of red-gloss wares such as arretine and samian, as does the existence of name-stamps on some of the lamps. makers' or workshop names were normally placed on the underside of the lamp, and are common on the usually undecorated lamps known as ' ('factory lamps'), a type which was popular in the military zones of the north-west roman provinces during the 2nd century ad. one well-known name is that of "fortis", and his products were evidently copied outside his own workshop in italy – or perhaps fortis had his own branch factories in the provinces. the gaulish ' in the adjacent picture, found in london, is stamped on the base with the name of the maker atimetus.