Just found.  Love these knives.  
Someone in the past has polished the blade unfortunatly.  
 
Blade patina helps date.  I'm having a hard time with this one.  The handle does show nice patina.  Maybe early 20th century.  
 
How old do you think?
Now, if I wanted to "age" or darken the blade.  What can I do?  I'm impatient, can't wait 100 years.  

   Was thinking of PCB board etchant.
-Stephen*