NuTemper Mainspring #627 for Hamilton 12s No. 6021 - Steel

NuTemper Mainspring #627 for Hamilton 12s Movements, Factory No. 6021, steel, new in envelope. Ya, I know the envelope says 6201 but typo's on mainspring envelopes tend to be pretty common - fortunately better attention was paid to the quality of the mainspring than it was to the accuracy of the envelope. See image for precise mainspring specifications and further details. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.