Universal equinoctial ring dial for all latitudes. Standard dial (see related terms) except for the following details:-

A bracket moves in the grooved rim of the meridian ring. There are hour scales on both the obverse side and on the inner-rim of the equinoctial ring. There is a date scale, a declination scale and the equinoxes are marked at 20 March and 23 September. 'S' and 'N' are marked at relevant ends of the bridge and the gnomon has glass in the pinhole.

The Dollond of the signature, 'Dollond. London', is probably Peter Dollond, who is known to have made sundials. It is very similar in design to AST0402.

For more information regarding this dial please refer to the OUP & NMM catalogue, 'Sundials at Greenwich'.