The ST9 clasp code was used by Noob five or six years ago on their Submariner watches. The engravings on the watch you have are not very good and are from an unknown factory as is the seven digit serial number.
The watch might have a 2813 or 2836 movement inside but my guess it's the cheaper 2813. The watch isn't made by CF and would stay away from it unless they want $100 max and even then I would still pass on it.
Hope that helps