J Russell Green River Works "Professional" 6" Boning Knife Carbon Steel Twine Wrap 1920 30s Natural Stone Shirogami #2 carbon steel core As an inherent element Shirogami #2 carbon steel core (hagane) with hand folded suminagashi cladding (jigane) With the adaptation of the drop forge first in Nogent the volume of knives that could be made was greatly increased however skilled hand work hand forging and hand grinding after drop forging was the norm dumping underpriced knives on the American market in an effort to bankrupt companies such as J Russell In the pre Civil War time period of the 1830s to 1860 Sheffield engaged in a protracted trade war with the new American knife makers