Marco Mainspring #493D for Hamilton 16 Model 992B, 950B No. 35434 - Alloy

Marco Mainspring No. 493D for Hamilton 16s Model 992B, 950B RR movements and likely others as well. Factory No. 35434 (534B), alloy, new in icky envelope. The D is for Dynavar so this is a factory mainspring repackaged by Marshall. See images for further details. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.