Seiko’s Australian product page identifies the SRPD55 as featuring an automatic 4R36 calibre and manual winding capability. It lists a 42.5 mm diameter steel case, Hardlex crystal and water resistance of 10 bar. These are manufacturer specifications, not the results of an editorial test. To decide how to use and maintain it, consult the model’s manual; this listing does not turn the stated water resistance into permission for any kind of water activity.
