Katana in Shirasaya(19th NBTHK Juyo Paper)
(Juyo paper was lost. But this blade has attestation of Juyo Token.)

Signature: Mumei (unsigned) Den-Sa Hiroyasu

The blade was polished.
Blade length : 62.72 cm or 26.66 inches.
Sori : 0.9 cm or 0.35 inches.
Mekugi: 2
Width at the hamachi : 3.15 cm or 1.24 inches.
Width at the Kissaki : 3.08 cm or 1.21 inches.
Kasane : 0.78 cm or 0.30 inches.
Era : Nanbokucho period.
Shape : The very wide Osuriage-Mumei Katana with long Kissaki.
Jitetsu :Koitame hada well grained with jinie and chikei attach.
Hamon : Koniedeki Gunome midare and ko-notare mix. In Ha, there are
Ko-ashi, Yo, Kinsuji and Sunagashi.
Boshi is Hakikake style and Yakitsume style.

Special feature :
Hiroyasu was a son of Chikuzen Sa Yukihiro. He moved to Aki province.
His signature's blade is only Hiratsukuri Tanto. This blade has beautiful Jigane. And this is remarkable piece of work.

19th NBTHK Juyo Paper
(Juyo paper was lost. But this blade has attestation of Juyo Token.)
Aoi Art estimation paper : whole Oshigata.