This Challenger II long distance boomerang is a very uncommon model made by Volker Behrens. I have seen only a half dozen of these and this one is in excellent condition. It comes from the collection of Al Gerhards. This boomerang was made out of 3 mm Paxolin material. It has a large lead weight embedded in the left arm tip. An additional weight has been added to the underside of the elbow with tape, an obvious weight tuning measure by Volker. The added weight covers the Bluestar logo and what looks like Volker's printed name. There is a " # 87 " printed on the underside. I think that the # sign is not associated with 87 (date) because Volker made very few of these and they were never numbered, but they were dated. The left handed Challenger II that I personally own has a flight range of more than 120 metres and it does require a moderate wind for a full return. This model is more difficult to throw than the Challenger III and it will take a strong and skilled thrower to take full advantage of this boomerang's potential. It is rare and that is why it was added to the collectible boomerang web page.