細節
A LATE 18TH CENTURY FRENCH SILVER OVAL 'BUTTERFIELD'-TYPE DIAL, signed on the undersudeCremstorff AParis, the horizontal plate with hour scale, engraved decorations of dolphins, sea-cratures and foliage, the inset compass with brass capped iron needles, the folding gnomon profusely engraved with scrolling foliage--3¼ (8.2cm.) long