Swartchild Black Shield Jr Mainspring for Font 120 - 123, 189, A. Michel 115 - Steel

Swartchild Black Shield Jr Mainspring for Font caliber 120 - 123, 189 and A. Michel caliber 115 bracelet movements, regular Tongue end, steel, new in envelope. These springs are packed in a smaller envelope for smaller caliber watches, hence the "Jr" designation. I likely have several of these so the exact packaging may be different. I specialize in hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item