Rare child's size - made for a boy.
Vintage silver mounted arab jambia dagger.  
Yemen or saidi arabia, circa first part of 20th century. 
Metal mounted grip and leather-over wood scabbard, probably silver-plated base metal. 
Grip is made domestic animal cattle h0rn.
   size:
About 8 3/4 in. (22.2 cm) long in scabbard (straight line). 
About 8 1/2 in. (21.6 cm) long out of scabbard.  
Blade is about 5 1/2 in. (14 cm) long.
  condition: 
Very good original uncleaned vintage condition with expected handling marks, honest wear and charming indication of age.   
 Rare vintage example.