BESTFIT Mainspring JA750 for Waltham 4 Ligne Baguette Model 400 No. 2240 - Alloy

BESTFIT Mainspring MS-JA750 for Waltham for 4 Ligne Baguette Model 400, Factory No. 2240, alloy, new in envelope. See image for precise mainspring specification. 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.