H. & W. Perrin Co. Mainspring for Rolex 374, Tudor 375, Elgin 748 - Alloy

H. & W. Perrin Co LTD Super Le Roseau Mainspring for Rolex caliber 374, Tudor caliber 375, Elgin caliber 748 and a host of 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.