HR Mainspring #276 for Excelsior Park caliber 8 Chronograph - Steel

HR steel mainspring #276 for Excelsior Park Chronograph caliber movements plus perhaps other similar ébauche watches, new in envelope. See images for precise mainspring specifications. I specialize is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.