All timepieces in the HMS1 line feature a classically styled 40 mm case in white gold, rose gold or stainless steel, with a see-through back cover and water-resistance to 30 metres. The hand-wound movements have double barrels that generate a power reserve of over 90 hours with more constant force and hence greater accuracy throughout the watch's run time. The line is available in a range of dial colours and with various finishes, depending on the model.