Help translate script on my koshirae

[Scogg]

There’s some writing underneath the saya cap, and some on the top of my tsuka. I have been struggling to get a translation and I hope someone can help! 
 

for reference this is on the saya and handle on an early Shinto, mino school, Mumei katana.

 

thanks for your help,

cheers,

[Scogg]

Script on end of saya under decorative cap depicting crashing waves