Ronda Mainspring No. 356 for Font caliber 1146 - Alloy

Ronda No. 356 Ronda-Flex mainspring for Font (FF) caliber 1146 and perhaps others as well, alloy, new in envelope. See images for precise mainspring specifications. 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.