Elgin Factory Mainspring for 5/0s & 6/0s No. 2890 - Steel

Elgin Factory Mainspring No. 2890 for 5/0s & 6/0s movements, steel, new in possibly frail and/or dirty envelope. Has the typical Elgin DB&H end. These came in several strengths and the ones that I can supply are shown in the variations list. I likely have several of these in each strength so the one you get may differ slightly from the images. Elgin mainsprings are coated in very old sticky grease and must be thoroughly cleaned before use. Images do a pretty good job of representing the item.