Ronda Mainspring No. 392 for FEF 360, Lavina 140, Pierce 861 - Alloy

Ronda No. 392 Ronda-Flex Alloy mainspring for Fleurier 360, Lavina 140, Pierce 861 linear automatic caliber movements and perhaps others, alloy, new in open 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.