Samson Mainspring No. A5 for Alpina 12 ligne caliber 582 - Steel

Samson No. A5 steel mainspring for Alpina 12 ligne caliber 582 movement and perhaps others, new in envelope. I know the envelope say Altina but that's a typo (see the last image). 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.