Marco Mainspring #3544 for Valjoux caliber 73VZM Chronograph - Steel

Marco Mainspring No. 3544 for Valjoux caliber 73VZM Chronograph plus perhaps similar ébauche movements, steel, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. 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 an adequate job of representing the item.