The no longer made 1857 springs were listed as 23 inches long with strength 0.22 mm and height/width 2.90 mm. Another option is the Illinois Spring JA-404, which is also a T End, Dennison strength 2 (0.22 mm). Sand 1879 Models factory mainspring # 2203, width in mm 2.9, strength in mm 0.225, length inches 21, end Tįor 18 size Waltham Model 1857 use this spring JA-701 which is strength Dennison 1 1/2 or Waltham Spring JA-703 Strength 2 1/2 (0.215 mm). We will then look up the serial number and send you the right mainspring. Just click order and in either the order instuction box, or the order comments box enter the serial number found stamped on the watch movement. Order Waltham Mainsprings By Serial Number

I have seen serial number information on American Watches posted on a few websites over the past five years Old time watchmakers had these books and sometimes they can be purchased at local AWI or NAWCC meeting. To find factory part number, which is listed for each spring listed you would need a serial number book as well as Waltham parts book by watch grade. The mainsprings listed here are by factory part number for the spring and the measurements for those who have the gauge and skill to measure a spring. Mainsprings for American made Waltham watches can also be ordered at the bottom of the page by the serial number stamped on the movement.

Waltham serial numbers nawcc