Elgin Factory Mainspring for 26/0s No. 5131 (300A) - Steel

Elgin Factory Mainspring for 26/0s movements, # 5131 (factory 300A), steel, new in envelope. Actual mainspring sleeve may differ slightly from the image and some of the envelopes are in better shape than others. These were available in a couple of different strengths and those that I can supply can be found in the drop-down list. See images for precise mainspring specifications. Elgin mainsprings are typically coated in very old grease and must be cleaned before use. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item