I got a hold of a Conn Connstellation when I was about 10 years old and I payed it up until I graduated high school. The weird thing is, I can't seem to find the years corresponding with the serial number (GK521719). I have included some pictures. Hopefully some one can help me out here. Last I heard, this trumpet is one of the few that survived from the factory burning down.... That's what some one told me one time, but i don't really know how true it is.