An ivory Bloud-pattern azimuth diptych dial, the underside with (corroded) calendar volvelle, the (incomplete) elipse decorated with scrolls and graduated with an hour scale, the compass card printed with the latitudes of fourteen continental cities, the lid with inset perpetual calendar volvelle with two smaller volvelles for days and phases of the moon, the cover with table of hours, the corners with coloured impressed scroll decorations -- 2 3/8in.(6cm.)wide, French, late 17th/early 18th century