Nice! This is also known as a RTF2G or RTF2-G because of the Fish Gills, Scallop, or Curved slide serrations. It looks like the early frying pan finish that should have first 3 alpha character numbers in the SN. The later ones had 4 alpha characters.
Thank you. Yes, it's an NGX range. I really like the finish too. Weapon is immaculate. Short reading up so far said it was ran for about 18 months and was the 2nd or 3rd rarest of them? The 19 was the hot one. I really like the texturing on the grip too.