PM Mainspring No. 534 for Bulova 10AE 21j Movements - Steel

PM No. 534 ONYX steel mainspring for Bulova caliber 10AE, 21j and likely a plethora of other 10 ligne 21j Bulovas. 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.