H. & W. Perrin Co. Mainspring for OMEGA caliber 690 - Alloy

H. & W. Perrin Co Le Roseau Mainspring for OMEGA caliber 690 movements and likely others as well, alloy, new in envelope. See images for precise mainspring specifications. H. & W. Perrin is the largest supplier of horological materials in Canada. These mainsprings are very new and are being sold at or below cost. Images do an adequate job of representing the item.