H. & W. Perrin Co. Mainspring for ETA caliber 620, 621, 622 - Alloy

H. & W. Perrin Co LTD Le Roseau Mainspring for ETA caliber 620, 621, 622 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 cost. Images do an adequate job of representing the item.