H. & W. Perrin Co. Mainspring for AS 970, 1003, 1030, 1171, 1254, 1354 - Alloy

H. & W. Perrin Co LTD Super Le Roseau Mainspring for AS caliber 970, 1003, 1030, 1171, 1254, 1354, KFG caliber 257, 258, 270, 340, 344, FF caliber 60, Buren caliber 355, 356, 357, 358 and likely others as well, alloy, new in envelope. See image for precise mainspring specifications and further details. 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.