An unusual precision longcase timepiece with duplex escapement and centre seconds Unsigned, late 18th century The four finned-pillar eight-day movement with tall plates and unusual deadbeat duplex escapement utilising two identical escape wheels applied to the same arbor and split anchor with unusual roller pallets regulated by substantial seconds pendulum with braced triple rod and 8 inch diameter lenticular bob, the 12 inch square single sheet silvered brass Roman numeral dial with concentric calendar to inner track and Arabic five minutes to outer track, the spandrels areas with rococo scroll and floral spray engraved decoration, in an architectural mahogany case with triangular tympanum over plain lintel and fluted columns with brass caps and bases flanking the glazed hood door, the sides with rectangular glazed apertures and bargeboards to the rear, the trunk with rectangular crossbanded caddy moulded door over recessed panel fronted plinth base with moulded skirt, 206cm (81ins) high.