HR Nivastar Mainspring G663 for AS 984, 1123, Venus 180, Cupillard 233 - Alloy

HR Nivastar Mainspring G663 for AS 984, 1123, Venus 180, Cupillard 233, Parrenin 87 caliber movements and quite likely others as well, white alloy, 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 a pretty good job of representing the item.