This Ball Engineer II Ohio Moon Phase is a really stunning watch on the wrist. With abrushed steel dial in blue with Arabic numerals, arrow hands with Tritium tubes and a date aperture at 3, and rich colors and markings of the moon phase beneath the main dial. 

The case diameter is 40 mm. Very high finished watch in all details, also with a screw-down crown,  anti-reflective sapphire, luminous hands and markers.

This Ball is in near mint condition and a full set. Real collector's item!