PM Mainspring for Venus caliber 170 Chronograph - Steel

PM Mainspring for Venus 12½ ligne Chronograph caliber 170 movements plus perhaps several other chronographs as well, ONYX steel, new in envelope. See images for further data and 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 a pretty good job of representing the item.