Comsco Mainspring #1198 for Howard 12s No. 552 - Steel

Comsco Mainspring #1198 for Howard 12s movements, Factory No. 552, hole end, steel, new in envelope. See image 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 and all watch parts are unconditionally guaranteed. Images do a barley adequate good job of representing the item.