細節
Anon. An unusual silver openface self-winding independent centre seconds watch with up and down indicator
Unsigned, dial signed Non Plus Ultra, circa 1830
The full plate gilt-finished movement wound by a round oscillating weight, the white enamel dial with outer Arabic five minute divisions, sweep centre seconds, centred by inscription Non plus ultra, eccentric small hour dial with Roman numerals, fan-shaped up and down indicator, in circular plain case with ribbed band, unsigned
52 mm. diam.