Swartchild Black Shield Mainspring for Admiral 12s - Steel

Swartchild Black Shield Mainspring for Admiral 12s Pocket Watch movements and perhaps similar ébauche watches, steel, new in envelope. I likely have several of these so the one you get may differ slightly from the images. See images for precise 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.