Marco Mainspring No. 3019 for Langendorf caliber 642 - Steel

Marco No. 3019 steel mainspring for Langendorf (Lanco) caliber 642 & Blancpain / LeCoultre caliber 52 movements perhaps others as well, new in envelope. 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.