FLW was the designation used by the German IF importer as he sold the frame to me. In the comms around the sale I got this info: "This (frame) was orginally built at the end of 2008 for Eurobike, not ridden too much, shown a lot." A bit of a demonstrator, also for the special paint options btw.
As I understood it at the time FLW was the IF designation of a lightweight tubeset used mainly for road racing frames. Looking in the IFRider.com archives I can see both Ti and steel racers with the FLW designation. The frame is a size Large equivalent 29er (620mm ETT) and is very light indeed. It has held up fine to more than two full seasons riding, including trips to the Harz and Ardennes. Wonderfully light and responsive, as well as comfortable.
Returning to this bike from the carbon fibre hardtail that replaced it I got a clear sensation of the lesser frame stiffness. But after a few miles of riding the comfortable ride stayed and my confidedence in the handling was just like before.
Enjoy!!