BOREL Mainspring JA215 for 6/0 Hamilton No. 718201 / 718202 - Alloy

BOREL Mainspring JA-215 for 6/0s Hamilton including Grades 987A & 987F, Factory No. 2321 / 2521 / 718201 / 718202, T end, Alloy, new in envelope. See images for further details. I likely have several of these so the one you get may differ slightly from the images. 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.