2500 dollars firm for this rare insulator the BOSTON SCREW TOP dug while looking for bottles in downtown Augusta, Ga. The line running down the side is not a crack or fracture but a crease left in the glass when it cooled down. This is what I was told by another bottle digger/collector. It has the bruise on the side and the top thread has some damage. I lowered the price after hearing from several knowledgeable collectors. Thanks, Bill.