Sandsteel Mainspring #718 for Omega Caliber 23.7T1, T2, T3 - Steel

Sandsteel steel mainspring #718 for Omega caliber 23.7T1, T2, T3 movements and perhaps others as well, new in envelope. These are most commonly found in early Trench Watches. See images for precise mainspring specifications. Sandsteel made three strengths for the 23.7 grade movements (700, 718, 719) presumably for the different jewel counts, but since they made the 23.7 for 20+ years I think the more likely case is they just changed springs during the run and perhaps discovered they needed a stronger mainspring. This one is the mid strength (.105). 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.