E. Howard 18s "N" Mainspring #55 (EXACT) - Alloy

E. Howard EXACT Mainspring primarily for 18s "N" movements but will work in 16s "L" movements as well, Factory No. 55, Hole End, alloy, new in envelope. See images for precise mainspring specifications. 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.