I used arrows to point out a couple of unusual features on this mechanism. Top arrow points to a lovely detail on the motion-works idler bridge - a notch - no reason to take the time to make the notch, other than it looks good. Second arrow points to the hour strike train stop lever spring - it has a pinned mount - usually these are not pinned. Lastly, the unusual tail on the hour snail detent spring. Neat details!