PM Mainspring No. 70 for Bulova 10AE, 10AN, 10AX, Font 1146 movements - Steel

PM No. 70 ONYX steel mainspring for Bulova caliber 10AN, 10AX, 10AH, 10AR, 10AE, 10E, 4AF, 4AH, 4AE and Font 10½ ligne caliber 10/1146 movements plus perhaps others. 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.