Samson Mainspring No. 5052 for Bulova 10AN, 10AR, 10AT, 10AW, 10AA, 10AS, 10AB, 10AE, 10AX, 10AZ, 10AM, 10W, 10AI - Steel

Samson No. 5052 steel mainspring for Bulova 10AN, 10AR, 10AT, 10AW, 10AA, 10AS, 10AB, 10AE, 10AX, 10AZ, 10AM, 10W, 10AI and a whole mess of Bulova 4 ligne movements plus many, many others as well, new in envelope. See images for further details including calibers supported (it's quite a list) and 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.