The ‘Montefortino’ type, initially produced in bronze by the Etruscans, was gradually also made in iron using Celtic techniques, whilst incorporating Celtic morphological features such as the expanded nape guard and articulated cheek guards. This process culminated in the development of standardised forms that would be adopted by the Roman Republican army, forming the core of the protective equipment of the manipular legion.
Metallographic analysis of selected specimens has revealed the gradual adoption of ironworking techniques derived from Celtic metallurgy, which were considered superior to bronze casting in terms of mechanical strength and shock absorption. This technological superiority, likely combined with economic considerations (the lower cost of iron compared to bronze), led to the transition from bronze to iron in the production of defensive weaponry, a process completed during the 3rd century BC.
Source: https://archeologiagalliacisalpina.wordpress.com/category/celti/





