Special Moon Phase tide indicator automatic Watch.
Apart from the regular moonphase in the upper part of the dial, this watch also has a small window in the lower part of the dial indicating waxing and waning of the moon. See picture underneath text.
--------------- waning ------------------------ new ------------------------- waxing -------------------------------- full
The movement is a 17 jewels AS 5206, called Battle Time. There is no name to the watch.
It is from around 1975.
Watch has a quick set for the moon phase.