Elgin Factory Mainspring for 5/0s No. 2705 - Steel

Elgin factory mainspring Factory No. 2705 for 5/0s movements, steel, new in (probably dirty) envelope. Has the typical Elgin DB&H end. See image for precise characteristics. I likely have several of these so the envelopes may differ slightly from the images. Elgin mainsprings are typically coated in very old grease and must be cleaned before use. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.