The back cover of the shown watch is missing and the watch is in a bad state...
The dimensions of the base platines are identical to the self winding version. There is little information to the watch shown.
The automatic version is also presented on the company's own museum Junghans in Schramberg and is designated as a Junghans J55. Further information on cooperation with Westclox: The Westclox-Mystery
On left: Automatic movement Junghans J56 (for Westclox); on right: manual winding-movement Junghans J56 (for Westclox)