Nivaflex Mainspring for Buren caliber 300, ETA caliber 705 - Alloy

Nivaflex Mainspring for Buren caliber 300 and ETA caliber 705 movements plus perhaps similar ébauche watches, white alloy, 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 an adequate job of representing the item.