Samson Mainspring No. 6050 for ETA caliber 900 & 1080 - Steel

Samson steel mainspring for ETA caliber 900 & 1080 movements and perhaps others, 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.