Westclox Wrist Watch Mainspring + Barrel - Wrist Ben, Judge, La Salle

Westclox Model W1 Mainspring with attached barrel for Wrist Ben movements including the Judge, La Salle and others, distributed by Hammel, Riglander & Co in New York, O.R. #34. Will need to be cleaned and lubricated properly before use since they've been on the shelf for over 50 years and are pretty sticky. See images for precise specifications and a look at it installed in a movement. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. See image for precise characteristics. Images do a suitable job of representing the item.