It could be possible to identify the knife even without pictures. If you provide enough details about the knife it's possible that someone will recognize it, or at least make a good guess, and then you could do a Google search based on their guess and possibly find a pic of it online.
So, is there any writing/engraving/markings/symbols/insignia anywhere on the knife (often the blade will have markings near the pivot area. some knives have symbols or engraved or stamped inserts in the handles). What is the measured length and style of blade (if you know the different styles of blade). What is the handle made of (brass, wood, deer stag, etc).
The more details you provide the better the chance that someone will recognize the description or at least make a good guess for you to investigate.