Wakizashi - hard to read kanji on tang

[PoppinGumu]

Hello all, I am struggling to make out the engraving. Was hoping someone better informed may recognize characters or could point me to a reference where I could try and match them.

 

Any and all assistance is appreciated.

[PNSSHOGUN]

The top looks like the usual start of "備州長船 Bishu Osafune Ju xxx", the lower characters are difficult but may be "祐定 - Sukesada". 

[PoppinGumu]

Thank you for taking the time to look and provide assistance. 

[SteveM]

Maybe trying to be 経家 (Tsuneie).