I bought my MUT silver in JAN 2019, after 1 month wore it, I found my moon phase not working properly. It took 15 days to complete a cycle rather than 30 days. I suggest you all ask the seller post a video, "pull out the crown, winds the hand for 15 days or 360 hours, observe how to moon phase operate". If moon phase complete the cycle (moon rise and moon drop) in 15 days, there will be a QC issue. If the moon stop at middle of the watch, you are good to go.
I purchased mine via ZF official web, but apparently they refuse to honor the warranty by not replying my message eventhought I keep message them. SO PLEASE MAKE SURE YOU ARE BUYING WORKING FULL FUNCTION MOON PHASE INSTEAD OF 15 DAYS MOONPHASE.