Marco Mainspring No. 3129 for Longines Caliber 9/47 - 9/4N - Steel

Marco No. 3129 steel mainspring for Longines caliber 9/47 & 9/4N movements, and perhaps others, T-end, new in envelope. See images for precise mainspring specifications. 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.