Previous answer is
Awataguchi Omi kami Tadatsuna
Special feature : 2nd generation Tadatsuna succeeded from his father first generation.
Tadatsuna is quite well known sword maker for making Horimono(engrave) on the sword.
Generally his hamon is Ashinaga Choji midare (long legs hamon) with a lot of sunagashi in Ha.
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Appraisal Quiz #306 (August 30nd, 2014)
Who made this sword do you think ?
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Hints. ※The picture will be enlarged
Blade length : 73.33 cm or 28.87 inches.
Sori : 2.4 cm or 0.94 inches.
Mekugi : 2
Width at the hamachi : 2.96 cm or 1.16 inches.
Width at the Kissaki : 2.09 cm or 0.82 inches.
Kasane : 0.55 cm or 0.22 inches.
Era : Middle Kamakura period
1.The blade is oosuriage mumei and very deep sori.
2.The Jigane is koitame hada and masanagare and very clear midare utsuri appear.
3.Hamon is active Cyoji midare and Kawazuko Cyoji midare,gunome, kogunome midare with thick nioikuchi and active bright hamon.
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