HR Mainspring A750 for Waltham 4 Ligne Model 400 No. 2240 - Steel

HR mainspring A750 for Waltham for 4 Ligne Model 400 (Baguette), Factory No. 2240, steel, new in envelope. See image for precise characteristics. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. See image for further details. Images do a pretty good job of representing the item.