Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
While agriculture was the chief and most extensively prosecuted occupation in Rome, other branches of industry did not fail to accompany it, as might be expected from the early development of urban life in that emporium of the Latins. In fact eight guilds of craftsmen were numbered among the institutions of king Numa, that is, among the institutions that had existed in Rome from time immemorial.
These were the flute-blowers, the goldsmiths, the coppersmiths, the carpenters, the fullers, the dyers, the potters, and the shoemakers--a list which would substantially exhaust the class of tradesmen working to order on account of others in the very early times, when the baking of bread and the professional art of healing were not yet known and wool was spun into clothing by the women of the household themselves. It is remarkable that there appears no special guild of workers in iron.
This affords a fresh confirmation of the fact that the manufacture of iron was of comparatively late introduction in Latium; and on this account in matters of ritual down to the latest times copper alone might be used, e.g. for the sacred plough and the shear-knife of the priests. These bodies of craftsmen must have been of great importance in early times for the urban life of Rome and for its position towards the Latin land--an importance not to be measured by the depressed condition of Roman handicraft in later times, when it was injuriously affected by the multitude of artisan-slaves working for their master or on his account, and by the increased import of articles of luxury.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=18