This watch is made of 440 high grade stainless steel, solid 18k gold on 2-toned models. With triple wrapped 18k gold on gold models. This time piece is perfectly weighted, and thus it has a perfect feel when you put it on. The bands of its bracelet are linked by threaded-screws, and the crown is a one solid piece screw down. The markings on its dial are 100% exact roman numerals, which are covered by a scratch-proof sapphire cystal. For authenticity, the serial number is engraved between the lugs, and for further authenticity there is a green hologram sticker on the back. This beautiful watch is water resistant up to 30 meters.