Marco Marshalloy Mainspring #415 for Hamilton 16s No. 718050 - Alloy

Marco Marshalloy Mainspring #415 for Hamilton 16s Movements No. 718050 (534B), alloy, new in envelope.  C & E Marshall repackaging of what is most certainly an original factory 718050, fitting the grade 992B & 950B. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.