Yes, the Cyma/Tavannes movement is pretty advanced for the time, and yes, it is funny how little protection was seen as a requirement for watches that were basically going on the frontlines. The Cyma WWW is pretty impressive as well. I have a few Cymas in the collection, and all of them are very handsome.
I am an AS fanboy though - anything they make seems to be incredibly reliable for me, and long may they stay that way.
The prices are slowly increasing, similar with CWC G10s. I think they might plateau though, despite the limited availability as the ultra-desirable pieces are the 6B/159s (Weems and non-Weems versions) and the WWW. These will always be the unappreciated workhorses who did the heavy lifting; it’s why I prefer them to the WWW.