Sandsteel Sandalloy Mainspring S2221 for Marvin 300N & Cort 506, 524 - Alloy

Sandsteel Sandalloy Alloy mainspring No. S2221 for several Swiss wrist watch movements, including the following;

Mainspring is new in envelope. See images for precise mainspring specifications. List above is excerpted from the Custom Sandsteel Appendix I provide with the Sandsteel catalogs I sell - check out that listing for more details. 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.