Marco Mainspring #3318 for LeCoultre ALARM Caliber 211 / 211M - Steel

Marco steel mainspring #3318 for LeCoultre caliber 211 / 211M - M1M alarm movement, new in envelope. this is the ALARM side mainspring, the time side uses a different one. See images for 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.