model of the Koden marine radar unit RB717A scaled in 1:25 as used in the Rettungskreuzer "Berlin" and many other ships
The model is build with a motor with a diameter of 4 mm, a gear reduction of 1:700, a decal printed on a Alps MD5500 and nickel plated hexagon screws with a wrench size of 0,6 mm.
Video is aviable on YouTube
https://youtu.be/OmiiE7CXVBI