Waltham Factory Mainspring for 20s Model 1862 No. 2200B - Steel

Waltham Factory Mainspring for 20s Model 1862 2nd series movements, No. 2200B, Steel, new in envelope. See images for further details. These can be pretty tricky to find - ok, really, really tricky to find.  I inspect all these older steel mainsprings carefully before I list them, and I unconditionally guarantee them. Images do a pretty good job of representing the item.