Thanks Prism99. I think it's estate sale thread. The tag inside the cone says " Green Label. 12,000 yards. 60/30 left twist. Vat Color Brown. Crown Converting Company. Lincolonton NC". I am going to assume it's cotton but I'm not sure. I'm a tad concerned about it's age. The seller wants 50 cents a cone plus shipping. They are big cones and the seller wants me to buy all 10 so it could be about $ 15 for shipping. That means 10 huge spools for about $ 20. A good deal if it's good thread. A bad deal if I throw it out.