Marco Marshalloy Mainspring 3273M for Longines 15.18, 15.23, Champ 21-9, Concord 487 - Alloy

Marco Marshalloy Mainspring 3273M for Longines 15.18, 15.23, Champ 21-9, Concord 487 caliber movements and perhaps other similar movements, typical Longines T-Brace end, 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 a pretty good job of representing the item.