Brass Single End Clock Key #12 (5.25mm)

Brass Single End Clock Key #12 (5.25mm) for mainspring winding & clock repair. I have lots of clock keys and it's a pain to list them all so if you need something specific let me know. I specialize is hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do an adequate job of representing the item which I think looks newer than the images suggest.