RN Mainspring No.740 for Bulova caliber 8AN, 8AZ - Steel

RN No. 740 steel mainspring for Bulova 8AN, 8AZ caliber movements and perhaps several others as well, new in envelope. See images for precise mainspring specifications. 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 an adequate job of representing the item.