Gyuto Minamoto Sukehisa carbon steel 25cm

Minamoto Sukehisa (源助久) — Masayasu Yoshitomo's workshop in Tokyo, a supplier of knives to professional kitchens until the early 2000s. The blade bears the 日本鋼 (Nihon-kō) marking, confirming solid carbon steel, and a distinctive diamond-shaped logo with the letters SK. The 25 cm length is probably the result of many years of sharpening the standard 24 or 27 cm size — a sign of intensive use.