Mainspring for Hamilton 18s Factory No. 232 - Steel

Unmarked Maker Mainspring for Hamilton 18s, Factory No. 232, steel, new in envelope. Mainspring is marked Imitation and looks suspiciously close to the mainsprings Waltham made for other makers. See image for precise characteristics. I specialize in hard to find watch parts and regardless of how it may look, all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.