Favorite Rational Mainspring 713H for Felsa 64, 298 & Fleurier 370 - Steel

Favorite Rational Mainspring 713H for Felsa calibers 64 & 289, Fleurier caliber 370 and is suitable for ETA caliber 2340 plus perhaps similar ébauche watches, steel, new in envelope. See image for precise mainspring specifications. Favorite Rational Mainsprings basically use the same part numbers as Bestfit so they're pretty easy to match up. 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 a pretty good job of representing the item.