CASE  .  Chrome plated,  34 mm . 

BACK  :  Screw,  steel .

            Outside it shows the S/N only  

            Inside, on watches with a low S/N , very often the initials are “CB” punched .

            For those with high S/N a number is punched .

MOVEMENT  .  Recta  1320  customized .

CASEBACK MARKINGS:  D. H.  only  . 

                       Indicatively, up to serial 594XXX punching is uniform and larger ( 2mm)  then,  still

                       uniform,  became smaller (1mm) .

S/N  .  6 digits . From the registered watches (41) there  may be three batches :

            1.   552XXX   /   561XXX  ;

            2.   582XXX   /   598XXX  ( the most numerous) ;

            3.   634XXX   /   636XXX  ( the smaller) 

NOTE  .  Batches and ranges are purely indicative .