Elgin Mainspring No. 6612-(E/A) for 11½ ligne Grade 643 (AS 1361) - Alloy

Elgin  Mainspring for 5/0s (11½ ligne) specifically Grade 643, 17-jewel, sweep second, automatic movement, Factory No 6612-E (sometimes also shown as 6612-A), alloy, new in envelope. The 11½ ligne movements are AS 1361 ébauche based so this mainspring will fit movements other than just the specified Elgin. See image for further details. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item