H. & W. Perrin Co. Mainspring for Cyma / Tavannes 384, 385, 386 - Steel

H. & W. Perrin Co Mainspring for Cyma / Tavannes caliber 384, 385, 286 movements and likely others as well, steel, new in envelope. See images for precise mainspring specifications. H. & W. Perrin is the largest supplier of horological materials in Canada. Images do an adequate job of representing the item.