Alloy Mainspring for Bulova 10AF, 10AJ, Alpina 647, Gruen 785, Font 30

Unmarked Maker Swiss Mainspring for Bulova 10AF, 10AJ, Alpina 647, Gruen 785, Font 30 caliber movements plus perhaps similar ébauche watches, GR Ref. 4880, white alloy, 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.