I recently received this very cool radial dial Wyler and would like any input on the era. The case is 31.7mm without the crown. It has a bumper movement that does also handwind. It's a front loaded movement (but I think all the Wylers may have been, for their special form of water resistance). I'm not trying to get an exact date, but a decade, or even better a five year window, would be great. Well, that and any additional information if you happen to be a Wyler expert.
Thanks in Advance