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
The oldest lays of Rome celebrated not only the mighty war-god Mamers, but also the skilled armourer Mamurius, who understood the art of forging for his fellow-burgesses shields similar to the divine model shield that had fallen from heaven; Volcanus the god of fire and of the forge already appears in the primitive list of Roman festivals.(15)
15. Cf. I. XII. Oldest Table of Roman Festivals
Thus in the earliest Rome, as everywhere, the arts of forging and of wielding the ploughshare and the sword went hand in hand, and there was nothing of that arrogant contempt for handicrafts which we afterwards meet with there. After the Servian organization, however, imposed the duty of serving in the army exclusively on the freeholders, the industrial classes were excluded not by any law, but practically in consequence of their general want of a freehold qualification, from the privilege of bearing arms, except in the case of special subdivisions chosen from the carpenters, coppersmiths, and certain classes of musicians and attached with a military organization to the army; and this may perhaps have been the origin of the subsequent habit of depreciating the manual arts and of the position of political inferiority assigned to them.
The institution of guilds doubtless had the same object as the colleges of priests that resembled them in name; the men of skill associated themselves in order more permanently and securely to preserve the tradition of their art. That there was some mode of excluding unskilled persons is probable; but no traces are to be met with either of monopolizing tendencies or of protective steps against inferior manufactures. There is no aspect, however, of the life of the Roman people respecting which our information is so scanty as that of the Roman trades.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=19