Sandsteel Mainspring for 12s N.Y. Standard No. 4282 - Steel

Sandsteel Mainspring for 12s N.Y. Standard movements, Factory No. 4282, Hole End, steel, new in envelope. I must admit that I do not know what model of N.Y. Standard this was made to fit, just be aware that this is NOT the same as the 4284 which has a Tongue end, even though the remaining characteristics are basically the same. 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.