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Swartchild
Swartchild Black Shield Mainspring for 12s N.Y. Standard No. 4144 - Steel
Swartchild Black Shield Mainspring for 12s N.Y. Standard No. 4144 - Steel
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Swartchild & Co. Black Shield Mainspring #21233 for 12s N.Y. Standard Model B movements, Factory No. 4144, steel, new in envelope. See images for further details. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.
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![Swartchild Black Shield Mainspring for 12s N.Y. Standard No. 4144 - Steel](http://www.vintagetimeparts.com/cdn/shop/products/1122329173.jpg?v=1705279701&width=1445)
![Swartchild Black Shield Mainspring for 12s N.Y. Standard No. 4144 - Steel](http://www.vintagetimeparts.com/cdn/shop/products/1122320663.jpg?v=1705279701&width=1445)
![Swartchild Black Shield Mainspring for 12s N.Y. Standard No. 4144 - Steel](http://www.vintagetimeparts.com/cdn/shop/products/1627147286.gif?v=1705279701&width=1445)