HR Nivastar Mainspring G385 for AS 1530, ETA 2390, Omega 320 Chronograph - Alloy

HR Nivastar Mainspring G385 for Omega 320 Chronograph, ETA 2390, AS 1530 caliber movements and perhaps others as well (including some Hamilton movements), alloy, new in possibly dirty or frail 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 is 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.