This is perhaps the most inventive of the moon phase watches I have found…
The Moon phase: Full moon is when the moon is at 6 o’clock. New moon is represented by the dark circle at 6 o’clock )and when the moon is hidden at 12 o’clock).
The Date: The 30+1 holes around the perimeter of the dial display the date with the 10 minute markers serve as reference points. For example: the marker indicating 30 minutes also shows the 15th day of the month (30÷2=15). These 5 day markers allow for the date to be read at a glance and after a short time, you can recognize the date intuitively.
CREDIT: OchsUndJunior.swiss