Seiko 6309 comes housed in a large cushion shaped stainless steel case that measures 45mm wide by 48mm long and 13mm thick, with nice 22mm lugs. Even though this is a large watch, the design wears extremely comfortably, and is and continues to be a favorite among Seiko collectors. The original factory case finish features circular brushing on the top, with polished sides and straight brushing on the bottom. There is a nice, elegant sharp line delineating the top brushed portion from the polished sides. The oversized crown is located at 4 o’clock and is recessed into the case for protection. One of the best features of the 6309 is the crown, which screws down securely for superior water resistance. This is in contrast to the prior 6105 models that did not screw down. The crown is attached via a two-piece spring-loaded stem that makes the crown pop out a bit after unscrewing it. It should be noted that the crown tube is not replaceable, so if it is stripped, it’s nearly impossible to be fixed. You will not have that problem with this watch. Ithas been fully serviced.