Sandsteel Mainspring for Hampden 18s No. Factory No. 1696 - Steel

Sandsteel Mainspring for Hampden 18s, Factory No. 1696, steel, new in envelope. See image for precise mainspring specifications. Note please that the 1696 came in at least three different strengths depending on how many jewels the watch had and those that I can supply are shown in the drop-down list. Why Hampden was too lazy to come up with different catalog numbers for them is a mystery we will likely never solve, but sadly they weren't alone in this practice. 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.