TEMP-RITE Mainspring for MST 288, Derby 67, Felsa 74 - Steel

TEMP-RITE steel mainspring for MST 288, Derby 67, Felsa 74 caliber movement 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.