Looking for Information on Rare Case Knife

[Dee]

Bought this knife about 20+ years ago and am looking to sell it but don't have a value. Am gonna try and contact Case and try to get it from there, but if anyone has any ideas it would be appreciated.

It is a Case XX Model DE 17506 with 440 steel made in Solingen Germany. It came in a high quality leather sheath numbered 585

Also, the badge in the scale was lost.

[Ranger99]

" Shepherd Hills Cutlery " should be the
first thing that pops up when you try to
look up "Case knife date codes " or any
of that
They used to have all the Case information
at that site