The Metropolitan Museum of Art 194191 portrait Jan Jansen Bockeltz ca. 1605–10 CC0 met open-vault open vault pocket watch chronometer gold ornate clock mechanical antique jewelry renaissance complex dial celestial timepiece luxury detailed goldwork 18th century watch astronomical and sundial Jan Jansen Bockeltz ca. 1605–10 Case: gilded brass; Dial: gilded brass, silver, and copper; Movement: gilded brass, partly blued steel, and silver Horology The Unsorted Room