Swartchild Black Shield Clock Mainspring 4.4 x .20 mm x 23¼" Ref 44-20 C 59

Swartchild & Co Black Shield Clock Mainspring, Tongue End, For Junghans 40/63 (Alarm), Ref. 44 - 20 C 59, steel, made in France. See images for precise mainspring specifications. I specialize is hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item