In lamps of this type, the discus rim is continuous. All have a handle except cats. 442 and 447. On the beveled nozzle top, between the discus rim and the flat raised nozzle tip, is a rather deep and wide groove. The base is marked off by two rings, the outer one bigger than the inner one, the sole exception being cat. 448, whose base has only one wide raised ring. The seven Getty lamps of type IX b are all signed, five in capital relief letters, printed upside-down: FORTIS (twice), STROBILI, ATIMETI, EVCARP; a sixth one in straight relief letters: PVLCHRI; the seventh bears an incuse tria nomina, LMADIEC, a workshop active in central Italy that only occasionally made Firmalampen. The six first workshops were active in northern Italy in the Flavian period (FORTIS kilns have been found near Modena). They specialized in producing Firmalampen. However, their products are geographically so widely dispersed and made over such a long time span that they probably developed branches in several provinces or were copied, not to say pirated, on a large scale and at least during the whole second century. The seventh signature, cat. 448, is an incuse tria nomina, LMADIEC, a workshop active in central Italy that only occasionally made Firmalampen.