Complete Ertec Arm Type 1.
You can identify Type 1 by meassuring the Aluminium DIsc to the outside of the Center Window Glass. The Aluminium disc is 25 mm diameter ( Type 2 is 35 mm diameter ).
The arm is supplied as photo number 2 and number 3 in the photo series show.
EXCEPT for one detail, the friction screw has tghe smaller diameter, as the main photo show.