Mmmmmm. DW PN. Among my collection consisting currently of mostly gens, my 2 DWs are still my favorites. FWIW, I have purchased a few spare movements (used) that almost all had small issues which caused the original owners to let them go. I have spent quite a bit of time taking the worst one apart and learning all I can about the movement. I have found that it is in fact quite robust, just prone to poor assembly and adjustment. I got one recently that wouldn't hold a stem and would stop when the stem was pushed in. It turned out that the hole for the stem release had not been bored deep enough, causing the plate that holds the stem not to engage its tab in the stem properly, also allowing it to interfere with the setting gear when pushed in. Drilling the hole deeper gave me a perfect-running spare. Adjustments of the chrono pieces is something I am working on learning, but from what I have seen so far, the DW movements are quite straightforward and adjust the same way as any other chrono. A little work with the finish, cleaning, oiling and adjustment will give me quite a decent watch.