I have been hanging on to this new in the box FWB 300 for many years. I had a letter from the factory some years back saying this was perhaps the very last full size FWB 300 to be manufactured in 1972 before the smaller FWB 300S came out. If not the last one, it was at least manufactured during the last week of manufacture of this model. I am wondering how uncommon these are, and what it may be worth? If anyone can give me some advice, I would appreciate it. 52 years old and aging well. I take it out twice a year to oil it down, other than that it just lives in my safe. I thnk FWB made some of the nicest air rifles ever produced. If only everything was built to this standard, what a nice world it would be.