Previous answer is
　Inoue Izuminokami Kunisada
Kikumon, Kanbun 5 Nen 8 Gatsu Hi (August 1665)
井上和泉守国貞
菊紋 寛文五年八月日

Features: This Inoue Shinkai is a work from the fifth year of Kanbun, changing its signature to Inoue Shinkai in the second year of Enpo. Because the first generation Kunisada became elderly, early productions were assisted by Izuminokami Kunisada as substitute. Around the fourth year of Manji, a sword was dedicated to the imperial court, and as a reward, he was granted the chrysanthemum crest, initially signing as Izuminokami Kunisada and changing to Shinkai in August of the twelfth year of Kanbun. He passed away in November of the second year of Tenwa. Inoue Shinkai is equally celebrated alongside Tsuda Sukehiro, both swordsmiths highly regarded with some joint works between Sukehiro and Shinkai. Previously questioned or denied works have been recognized as authentic through research, highlighting the impact of their friendship on their creations. Generally, Sukehiro is known for dynamic wave patterns, while Shinkai for straight patterns with deep nioiguchi.

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Appraisal Quiz #784 (March 2nd, 2024)
Who made this sword do you think ?
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Blade Length: 70.2 cm (27.64 in)
Curvature: 1.7 cm (0.67 in)
Mekugi Hole: 2
Width at Base: 3.3 cm (1.30 in)
Width at the End: 2.4 cm (0.94 in)
Thickness of Rim (Kasane): 0.7 cm (0.28 in)
Sword Weight: 800 grams
Shape: Large width with a deep curve, with significant sori and a robust kasane, featuring double hi on both sides.
Jigane: Fine ko-itame hada well-kneaded with mokume hada mixed in, showing reflections.
Hamon: Ko-nie deki suguha bright and clear with a soft habuchi, featuring small ashi and a large, round boshi.

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