BOREL Mainspring 4540-NN for Landeron caliber 48 Chronograph and variants - Alloy

BOREL Mainspring 4540-NN for Landeron caliber 48 and variants 46, 47, 49, 50, 51, 54, 55, 56, 57, 58, 59 caliber chronograph movements plus perhaps similar ébauche watches, white alloy. 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 a barely adequate job of representing the item.