SWC Mainspring for ETA caliber 2890, 2892, 2892-2 Automatic - Alloy

SWC Mainspring for ETA caliber 2890, 2892, 2892-2 automatic movements and likely others as well, alloy, new in envelope. See images for further details.  These mainsprings are new and are being sold at cost. Images do a very good job of representing the item.