Katana signed Kagemitsu

Katana signed Kagemitsu,This is a beautiful long katana  Signed kagemitsu but I dont believe the signature to be reliable ,very well forged blade with nice hamon and well cut hi / grooves mounted in a very nice Shirasaya with buffalo horn inserts.I would say this katana has been made in the style of Kagemitsu much later.being sold as a mumei sword.