Swartchild Black Shield Mainspring #19356 for Waltham Colonial A No. 2234 - Steel

Swartchild Black Shield Mainspring #19356 for Waltham Colonial A Movements, Factory No. 2234, steel, new in frail envelope. See images for further details. 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 and all watch parts are unconditionally guaranteed. Images do a satisfactory job of representing the item.