Marco Unbreakable Mainspring 274P for Waltham 6¾ Ligne Model 675, 677 Factory No. 2263 - Alloy

Marco Unbreakable Mainspring #274P for Waltham Factory No. 2263 for 6¾ Ligne Model 675, 677, alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ very slightly from the images. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. See image for further details. Images do a pretty good job of representing the item.