HR Quick Fit Mainspring K545 for Aurore 42, Marvin 520, 535, Wittnauer 11T - Alloy

HR Quick Fit No. K545 white alloy mainspring for Aurore 42, Marvin 520, 535, Kurth 23 - 20, Wittnauer 11T caliber movements plus perhaps many others, 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 a pretty good job of representing the item.