Junghans Mega Radio Controlled Watch
How do the Push Buttons work?
The middle button is used to choose the operating modes and to perform manual synchronization of the watch. Please note the nice ergonomic position of the larger push button at around 9:30 hours instead of 9 hours.
The two smaller pushbuttons are used to set the time manually, one button will advance, the other reverse the minute hand. The strap is thicker on the right hand of the case, that is where the external antenna is leaving the watch case. See this best on the back page.