Alloy Mainspring for 16s Illinois No. 47333

Unmarked Maker Alloy Mainspring for 16s Illinois, Factory No. 47333, new in envelope. See images for further details and precise mainspring specifications. These mainspring were covered in some sort of lubricant that has gotten sticky so they'll need to be well cleaned before use. 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.