Previous answer is
Special feature : Masashige(sengo) is a leading student of Muramasa and his piece is identical to his mentor.
The hamon matches at the front and back. Sunagashi and Kinsuji works could be well observed. Boshi is hakikake style.
Appraisal Quiz #324 (January 9th, 2015)
Who made this sword do you think ?
Hints. ※The picture will be enlarged
Blade length : 27.9 cm or 10.98 inches.
Sori : 0.2 cm or 0.07 inches.
Mekugi : 1
Width at the hamachi : 2.56 cm or 1.00 inches.
Kasane : 0.45 cm or 0.17 inches.
Shape : The blade is regular size mihaba and Kasane with nice shape.
Jitetsu :Koitame had and mokume hada mixed with jinie attach beautiful texture.
Hamon : Niedeki gunome midare and square shape style mix, in Hamon there are sunaagashi
and small kinsuji work. Boshi is round shape hakikake style yakisage.
Answer will be posted at next Appraisal Quiz.
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