Elgin Resilient Mainspring 4/0 4789 .0045 295 1/2 .114mm Genuine Unused Old Stock

Elgin Resilient Mainspring 4/0 4789 .0045 295 1/2 .114mm. This item has been tucked away since before the 1960's in a cabinet. These vintage spares have not been used and are sold without warranty. All sales are final with no returns unless the wrong item has been sent or the item is incorrectly described. Please ask any questions before purchasing and I will try to answer them. Please view images.