The watch is in working order. Lunar calendar, date and day of the week switch automatically. The month showed January, but moved to February. I have not seen when and how this happened, so I cannot guarantee that the month counter will work correctly. The buttons on the case switch only the days of the week and the lunar calendar. The watch case is in very good condition, all covers are tightly closed. The dial is damaged. Take a good look at the ph...oto and ask questions.Case diameter 51 mm In any case, we strive to ensure that our customers are 100% satisfied with our products. Positive feedbacks will be returned in a timely manner. If for any reason you are not satisfied with your purchase, we ask you to inform us about this before leaving a negative feedback, and we will do our best to resolve any issues to your FULL satisfaction! Thank you in advance!