That is cheap!

"A medium categorized weapon?!" Robin was extremely surprised by the patriarch's words and returned to examine the sword more carefully

Billy laughed at Robin's reaction, "During this Last period we have been busy distributing workers, finding new mines, and so on... and these similar swords are the first batch of the factory products... 

As for that medium categorized, it is another story... When we started to melt the needed metals for the low categorized weapons for the first time, we found that the time it took to melt them was much less than you expected, so I ordered an experiment to put metals that can produce medium categorized weapons in furnaces to see what happens.. 

and that piece of metal is in your hand now, took the furnace a few hours to melt that small piece completely, but in the end, it melted and was easily formed by an ordinary mold to get this sword!!"