SWC Mainspring for ETA caliber 2824, 2824-A2 Automatic - Alloy

SWC Mainspring for ETA caliber 2824, 2824-A2 automatic movements and likely others as well, alloy, new in envelope. See images for further details.  SWC mainsprings are very new and are being sold at cost. Images do an adequate job of representing the item.