Oliver, this may not be Turkmen kard in terms of location, but one theory is that this type was made by Turkmen (or possibly other Central Asian) people living in Syria. This is solely an unproven theory and this could be any ethnic group in the region including Kurds. However, these knifes are not well known to be Kurdish (to me
. Many have re-purposed blades from other weapons which could be an indication of whoever produced them not having easy access or means to producing their own, i.e. a minority group living in a foreign land. I believe Kurds had some access and means resulting in better defined style such as their trademark and relatively uniform "Kurdish Jambiya". Again, just an unsubstantiated thought.