The third photo which shows "Weber-Steven Products Co., Wood Dale, Ill." is printed on the last page of the booklet. This cookbook came with my Grandparents 18.5" Red MTH Wood Dale Kettle that they recieved as a gift for their first Wedding Anniversary in 1962. That being said I suppose it is possible that the grill was actually made in 1961. There doesnt appear to be any other fine print in the booklet that would give us any other clues. I will go through it again after work tonight to make sure I didnt miss anything. Duke, do you know what year that booklet is from?