Citizen Auto Dater UNI 40m . Couldnt open back, but is guaranteed authentic. Its model # is ADUN-1401-C. It has 20mm lugs and has a Black Croc leather by Buffalo Geneve. . It has its waterproof rating in Blue at 40m. It is a 17 jewel. It has no quickset. Its acrylic crystal is new, replaced. It keeps time. Changed Mind,Doesnt fit or Didnt Like as the reasons for return will approve the return automatically and allow a pre-paid label to be printed(Free Returns). Choosing Defective or Not as Described will require a detailed explanation and is a longer drawn- out process. International buyers have to return at their own expense w/ tracking, and will refund entire payment when received back. Thanks for understanding. Changed Mind,Doesnt fit or Didnt Like as the reasons for return will approve the return automatically and allow a pre-paid label to be printed(Free Returns) and entire payment returned.. Choosing Defective or Not as Described will require a detailed explanation as a few of those entail stiff monetary penalties to the seller by EBay and is a longer drawn- out process. International buyers have to return at their own expense w/ tracking, and will refund entire payment when received back. Thanks for understanding.