Paulson Mainspring No.7M for Font 120 - 123 & Unitas 190 - Steel

Paulson No. 7M steel mainspring for Font caliber 120 - 123 & Unitas 190 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.