Your Kershaw Leek dates to the early 21st century, ca. 2007-2009, and comes from an obscure coastal hill people in the Northwest continental United States known as the "Tualas,"  a sub-tribe of the Or-e-gonians, who are centered around the village of Tualatin.
Oops... my bad... wrong knife. 
Nice barung, and I hope your mom gets a nice bouquet of flowers this next Mother's Day. 
Anyway, to me, based on the tarnish, the shank collar 
appears to be silver... I am looking forward for the opinions to come in regarding age (and I see with Robert's post they already are). 
Welcome to the (New and Improved) forum BTW...