NuTemper Mainspring No. 143 for Benrus W movements - Steel

NuTemper No. 143 steel mainspring for Benrus caliber W movements, and quite likely others, new in envelope. See images 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.