Steel Patek Philippe Aquanaut 5167/1A-001. Case diameter 40mm water resistant to 120 meters., sapphire crystal see through case back. Automatic mechanical movement, caliber 324 S C movement, 21K rotor with Geneva Seal. Embossed black degrading dial, white luminescent applied white gold Arabic numerals and hands with outer minute markers. Rubber strap with double folding clasp. Box and papers date January 2012. Our reference S19231.