NuREZISTA Mainspring #658 for Howard 12s Factory No. 552 - Steel

NuREZISTA Mainspring #658 for Howard 12s movements, Factory number 552, steel, new in envelope. See image for further details. 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.