Historically, road swords were originally pioneered by the Vikings and Norse cultures. During the medieval warm period melting ice left behind sediments that were rich in iron ore. They learned to refine this ore by burning the soil repeatedly until they had enough raw iron to start forging rods. These rods would them be welded together in a primitive furnace and shaped into a rough blade. Then the edges were sharpened enough to slice flesh. Though a true broadsword was most often used for shattering and enemies legs with one fell swoop.
Real-world broad swords were typically rife with impurities, which have them strange sort of dirty patterns on the surface. This is what you see represented in this model. Though in truth it is made from plastic and intended to be used as a costume prop, rather than an actual LARPing weapon.