MOVEMENT : Signed (TARTS. LONDON) and numbered (753), with engraved and pieced double footed balance cock. The “lace” edging to the balance cock is typical of the 1760s. Nice square pillars and worm screw mainspring set up. It is running well (to about a minute per hour) and the calendar mechanism is complete and working.

DIAL : The white enamel dial is about 40 mm in diameter. It is in good condition but with one hairline from the date aperture to the edge at 8 and some cracks and scratches around the edge between 4 and 6 o’clock.
The date aperture, with silver rim, shows the date numerals on the under dial calendar wheel.

INNER CASE : Full hallmarks for London, 1764, maker TS. The hinge is in good condition and the case snaps shut nicely. The high dome crystal has a few scratches but otherwise good. The bow and pendant are fine but with the usual repaired join to the case. The silver is in very good condition.

OUTER CASE : Matching hallmarks to the inner and again in very good condition. The hinge and catch are fine and the case snaps shut nicely. The catch button is present but dented. It is a large case, about 55.5 mm in diameter.

Loomes list Tarts in London during the second half of the 18th century and suggests the name was used by J. Stratton for watches made for the Dutch market.
This is a good quality London made watch, possibly made for export, and not a continental lower quality version.