ARSA  D.H.

CASE  :  Chrome plated,  33 mm .

BACK  :  Screw,  steel .

 the S/N  and  “ Stahlboden “ .

Inside, “ GR “ ( for low S/N ) or “FT “ .

MOVEMENT  :  UNITAS 173 or 174 .

The manufacturer’s name and the type of “cal “ are on the wheels bridge .

CASEBACK MARKINGS:  D.H.  only 

Letters larger ( 2 mm ) than numbers ( 1,5 mm ) .

S/N  : 4  or  5 digits.  From the registered watches ( 125 ) are supposed two possible batches .

 – with 4 or 5 digits the range could be  15XX  /  24XXX ;

 – with  5 digits  the range could be  27XXX  /  41XXX .

NOTE  :  Batches and S/Ns are purely indicative .