NuPower Mainspring for 10s Elgin 5726 (6001) - Steel

NuPower Mainspring for 10s Elgin movements, Factory No.5726, steel, new in envelope. More typically found as a Durapower under the number 6001 - they are the same mainspring this one is just steel. These are made for the late model 542, 543 & 546 10s pocket watches and are 7 1/2 x 5 1/2 x 17 or there abouts. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.