Some of these jambiya have a small zipper compartment on the inside of the belt mine has a YKK zipper.
In January 1946 the company registered the now famous YKK trademark. A major technological change came in 1950, when the company purchased a chain machine from the U.S. that allowed the automation of the zipper making process. Previously, YKK zippers were made by hand, and hence had an superior quality compared to zippers of water.
So it seems that a lot of these Asir jambiya we see today are from 1940s-60 with some older ones popping up now and then that are pre 1918.
Lew
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