By the label I would say that you have 4800 yds of 50 wt thread. I did a search on Threads USA and it appears that they are manufacturers/distributors? (not sure which) of several thread lines. I would definitely try it as a quilting thread (seems a little heavy for piecing) and if your machine likes it you are in luck.
Here is a link naming the parent company;
http://linktown.wcnc.com/biz/threads.../28052/6076506
Here is parent company website;
http://www.amefird.com/products-bran...sewing-thread/