It s a short blade a wakiazshi .

It bears the signature of  sukesada 祐定 who is part of a long line of blacksmiths from the province of Bizen .The signature is too short to identify a particular blacksmith but the style of this sword is faithful to the tradition of this school . 

• Its kissaki is a medium type and its  boshi is a ko-maru  :

• Its hada is a itame :

• Its hamon is a gunone regular and nioi :

• Its mune is a   hikushi :

• Its yasurime is a katte-sagari and the shape of this tang is  hagari kurijiri :

• Habaki is in silver  .
• the shinto osafune school , it s following the  bizen school from kamakura period but during the beginning of the Edo period, a flood has damaged the forges and it goes out of fashion until the shinshinto era at the end of Edo . All blacksmiths are called sukesada and have a longer signature to recognize them.
• Its in a  shirasaya with a protective silk fabric .
• Polishing is good with a few small drops of rust  in sashikomi style .