HR Mainspring No. 475 for Bulova 4AH, Font 29, 54, 175, Felsa 415 caliber movements - Steel

HR No. 475 steel mainspring for Bulova caliber 4AH, Font 29, 54, 175 & Felsa 415, new in frail 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 a pretty good job of representing the item.