Marco Mainspring #284 for Waltham 6/0s Jewel & 1942 Series No. 2226 - Steel

Marco Mainspring No. 284 for Waltham 6/0s Model 1898 "Jewel Series" Hunting style movements and the 1942 Military wrist watch movements. Factory No. 2226, steel, new in envelope. These are grade names for the better of the 6/0 size movements: Diamond, Riverside, Ruby and Sapphire - hence the name "Jewel Series." See images for further details. 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 a pretty good job of representing the item.