The non- screw down crown at 3 is for the time, date and moonphase adjustment . There is no crown or button at 9. The watch is smaller than my MD-703 diver which actually fits my wrist well. Rotating bezel. Original Strap with gold plated clasp.The previous owner confirms that it is a moonphase . The moonphase is set at about 39% full from where I am located. Watch is like new. previous owner still looking for the owner's manual. I cannot find any manual to download on the web for this model.