N.B.MS Alloy Mainspring for LONGINES caliber 10/68N

N.B.MS Swiss Mainspring for LONGINES caliber 10/86N movements and I believe 10/85 & 10/86 as well movements as perhaps other similar ébauche watches, white alloy, new in envelope. 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 an adequate job of representing the item.