BESTFIT Mainspring JA415 for Illinois 16s RR Watches No. 47326 / 47327 - Alloy

Bestfit Mainspring MS-JA415 for Illinois No. 47327 for 16s Railroad Model Bunn Special & Sangamo Motor Barrel movements EXCEPT 60hr models, steel, new envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.