This wakizashi appears to be a Mino tradition wakizashi from the Muromachi period.
The blade is out of polish. The crushed shell saya appears to be original to the sword, but the tsuka looks to be scavenged from another sword.
Tsuba looks to be Edo period.
Nagasa: 48.24cm/19"
Motohaba: 25.3mm/.99"
Sakihaba: 17.7mm/.7"
Motokasane: 6mm/.24"
Sakikasane: 5.2mm/.2"
