Mark, Win 13s were the last production run the Winchester made from Jan. to June of 1945. Serial # range approx. 1,601150 to1640000. Check the right receiver leg to insure that the drawing # D28291WIN13 is present. Incorporates most of the changes made in specific parts during the war. ie the op rod is no longer the slant cut, but the straight cut, flat side op rod. The serial # range is out of sequence. All of these things , plus the sheer collector value of the Winchester logo and trade mark make the WIN13 a sought after item. Condition makes a difference as does degree of completness. I would hazzard a guess a guess and say somewhere in the $1500 to $1800 range.