It is a Bao An knife made in the last 30 years or so.
(
http://www.vikingsword.com/vb/showth...ighlight=baoan)
I have a single knife example that is very similar, also from Gansu that I like very much. These are solid knives from an ethnic Tibetan minority and would also likely be available in Kashgar. So while I would not say it is antique, it is very much of ethnographic interest as the product of an active knife wielding society. These were made for use
Josh