H. & W. Perrin Co. Mainspring for CERTINA caliber 204 and MST caliber 281 - Alloy

H. & W. Perrin Co LTD Super Le Roseau Mainspring for Certina caliber 204 and MST caliber 281 movements and 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 Le Roseau mainsprings are very new and are being sold at or below cost. Images do an adequate job of representing the item.