Gunther Mainspring No. 109 for Waltham 6s No. 2217 - Steel

Gunther Efficiency Unit Mainspring No. 109 for Waltham 6s, Factory No. 2217, steel, new in envelope. See image 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 and all watch parts are unconditionally guaranteed. Images do a suitable job of representing the item.