I have a 143w2 with serial no W1468911. Can anyone tell me the year it was built? I also have a fixed head treadle singer machine that has a wooden box that you place over it for storing. It has a number on the back side of it : 7330233. It has the Singer logo stamped underneath and the base is peanut shaped. Does any one know the year of manufacture? I have attached pictures of both. Thanks.