The swiss patent number 51482 is featured in these posts: here and especially here where Trim provides a picture to accompany the patent, which is here.
Today I acquired a Gruen Caliber 98 with the patent number of 51482 next to the Swiss Cross. This is the same patent that is presented in the above threads and is registered to Fontainemelon.
Now the winding mechanism at first glance doesn't look like the images associated; heck not at all really. But is is similar in set and clutch levers. In the examples on the trench watches also marked with this patent number they all have the distinctive circular detent. This simply has what looks like a return spring. What gives?
Here are more pictures...
The other thing that strikes me is the similarity in the arrangement of the barrel bridge with the distinctive ratchet and crown wheels. It is similar to other high end Gruen movements, such at the cal 47, the cal 93 and some of the pocket watch movements that Art B. has discussed, example here. I have seen the Swiss patent number 31609 associated with this set up, and registered to C.H. Meylan but I do not have a corresponding image.
Anyone have some ideas?