HR Ev-R-Last Mainspring E545 for Marvin 520, 535, Aurore 42, Bulova 13AF - Steel

HR Ev-R-Last Mainspring E545 for Marvin 520, 535, Aurore 42, Bulova 13AF, 13AL, 13AN & 13AT caliber movements, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in 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. all calibers supported and