One of the forum members asked that I post photos of my Nobukuni. Tanobe placed this piece to late Nambokucho, and was not able to give the specific generation. Sayagaki with translation follows...
城劦信國 – Joshu (= Yamashiro no kuni) Nobukuni
但薙刀直無銘也初代與應永信國ノ閒ニ位置スル工而年代ハ南北朝末期也
地刃ノ出来宜敷殊ニ互乃目ノ刃取ノ形ニ其特色ヲ顕現シ候彫物モ巧技也
- However, it is a Naginata-naoshi without a mei. The smith is thought to be Nobukuni between the 1st generation and later one in Oei era, and the period is around late Nambokucho. The workmanship of the blade is good. Especially, the shape of its Gunome pattern clearly shows his characteristic. Also the carving is excellent.