This is a SEIKO SUS. It's a somewhat old model, but the black dial and precise design are chic, functional, and even futuristic, I think. The watch functions, of course, and the chronograph stopwatch and alarm functions also work. For instructions, you can download the SEIKO manual 7t32. The battery is for operational check, so I recommend replacing it with an SR battery. The band has one extra link added, so it fits a wrist of about 175mm. (It can be extended by 3mm with one hole.) There is a scratch on the upper left of the case. There are also fine scratches overall. Please purchase only if you can accept this. It says 10atm water resist. Does this mean it's 100m water resistant? (The packing has not been replaced.) I think the size is also exquisite, not too big and not too assertive, making it an excellent watch.