H. & W. Perrin Co. Mainspring for Valjoux 23, 23C, 72, 72C - Steel

H. & W. Perrin Co Mainspring for Valjoux caliber 23, 23C, 72, 72C & many other Valjoux variants and other as well such as the Benrus VZH, VZHC and perhaps even more still, steel, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. H. & W. Perrin is the largest supplier of horological materials in Canada. Images do an adequate job of representing the item.