Steel Mainspring for 18s Zenith Pocket Watch - Steel

Steel Mainspring for 18s Zenith Pocket Watch movements, DB&H end that is unique to Zenith, new in envelope. Measures Dennison ~24 x 4 which is suitable several Zenith 18s movements from well before 1930. Mainsprings come from a jeweler in Canada which makes sense since Zenith Pocket Watches were common in Canada RR service. See images for further details. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.