Favorite Rational Mainspring 611G for Oris 361, 362, 370, 371, 450N, 451, etc - Steel

Favorite Rational mainspring No 611G for Oris calibers 361, 362, 370, 371, 450N, 451, 451N, 452, 453, 456, 457, 458, movements plus perhaps similar ébauche watches as well, steel, 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.