PM Mainspring No. 13 for Bulova 6T & 6AT + Gruen 117 to 119 - ONYX Steel

PM Mainspring No. 13 for Bulova caliber 6T & 6AT plus Gruen 117 to 119 caliber movements, and quite likely others, ONYX Steel, 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 a pretty good job of representing the item.