Ronda Mainspring No. 304 for ETA caliber 1280 & Bulova caliber 10BC, 10BS - Alloy

Ronda No. 304 Ronda-Flex Alloy mainspring for ETA caliber 1280 & Bulova caliber 10BC, 10BS movements and perhaps others, new in sealed 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.