The quintant, once owned by King Edward VII, has a silver frame and an ivory handle.
This stunning device could be used by mariners to plot their position, although this one probably never left dry land.
Mounted at the centre of the frame in silver relief is the three-feather crest of the Prince of Wales inscribed with his motto ‘Ich Dien’ (I serve) on a ribbon.
The lower decoration includes a British ensign (by implication the general red, senior ensign at this date) and the Royal Standard, with thistles, roses, clover and a daffodil symbolizing Scotland, England, Ireland and Wales.
The quintant is contained in a rosewood keystone box lined with blue velvet and bearing on the lid the crest of the Prince of Wales in silver. This instrument was shown by Janet Taylor at the 1851 Great Exhibition in London and was later presented to the Prince of Wales (subsequently King Edward VII, 1841-1910).