Elgin Factory Mainspring for 12s No. 1712 - Steel

Elgin Factory Mainspring for 12s movements, Factory No. 1712, hook end, steel, new in possibly very frail envelope. See image for further details. These were available in a couple of different strengths and those that I can supply can be found in the drop-down list. I have several of these so the one you get may appear slightly different than the images. Elgin mainsprings are typically coated in very sticky grease and must be cleaned before use. Images do a pretty good job of representing the item.