《明史·志·卷四十四》
武将中被委以重任的，征西、镇朔、平蛮等将军，用银印，虎形印纽，三寸三分见方，厚九分，刻以柳叶形篆文。
武臣受重寄者，征西、镇朔、平蛮诸将军，银印，虎纽，方三寸三分，厚九分，柳叶篆文。
Generals who were entrusted with important responsibilities, such as the general who pacified the west, the general who guarded the north, and the general who pacified the barbarians, used silver seals with tiger-shaped knobs, with a side length of 3.3 inches and a thickness of 0.9 inches, and inscribed with willow-leaf-shaped seal script.