Hello Gary!
The knife you have here is a Syrian jambiya from the Golon Heights. These were made during the french ocupation. Which whould place yours to the mid 20th. century. I have two of these. Yours apperars to be a using piece used as part of the traditional dress, probably from the 1950-1960's.
Mark...
These are my two.
http://www.vikingsword.com/vb/showth...ighlight=syria
http://www.vikingsword.com/vb/showth...ghlight=syrian