seand

Hi Guys, I have had an IWC Mark XVI A-2892 from Joshua at perfect clones for about a year. The strap needs to be replaced. I have been looking at BOB WATCH BANDS FOR IWC. Which size do I need the 20/18 mm or 19/16mm? Recently I have had issues with the date not working for a few weeks. About the same time the watch will just stop about every other day. If I unscrew it wind it a few times add in a little shake and it's starts working again. I'm guessing it just needs to be serviced. Can I just take it to local watch repair shop? I will post that issue in a seperate topic if needed. Thanks, Sean