Dynaflex Unbreakable Mainspring for ETA caliber 900, 925, 930 - Alloy

Dynaflex Unbreakable Mainspring for ETA caliber 900, 925 & 930 movements, alloy, 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.