Need to find a Case Mariner Sheath

[paschalb88]

Hello I'm new to the site and knives. Grandpa gave me a case xx 6265 sab knife that he bought while in navy. It Is the bone handle and the mariner set, I think it's called. His father had it before me and got rid of sheath and marlin spike. Was inquiring as to how hard it would be to find this sheath and spike to put with knife. Sentimental reasons. Any help is appreciated.