H. & W. Perrin Co. Mainspring for ROLEX caliber 1210 Movements - Alloy

H. & W. Perrin Co LTD Le Roseau Mainspring for ROLEX caliber 1210 movements and quite likely others as well, alloy, new in envelope. See image for precise mainspring specifications. H. & W. Perrin is the largest supplier of horological materials in Canada. All Perrin mainsprings are very new and are being sold at or below cost. Images do an adequate job of representing the item.