Waltham Factory Mainspring for 00s (2/0s) Factory No. 2221 - Steel

Waltham Mainspring for 00s (Basically 2/0s) Model 1891 movements, Factory No. 2221, steel, in old frail envelope. See images for further details. These came in a couple of different strengths, and those that I can supply are shown in the drop-down list. Mainsprings have been on the shelf for probably close to 80 years but I inspect all these super old steel mainsprings carefully before I list them, and I guarantee them unconditionally. Not a common mainspring so get them while you can. Images do a pretty good job of representing the item.