that should be a 68" bow? does it have a 50 something lettered in a small circle?
the mamba line, hunter, highspeed, sharpshooter, etc. were some of the first recurves damon built. pretty straight limb with almost a static recurve on the first generation, modified to a more gentle shorter recurve on later models.
only damon or t.j. stewart were bowyers during that time frame. lacquer finish by edna howatt, skived leather grip by ted donnelson.