Heraldic quadrant up for sale in England

A brass quadrant bearing the arms of Richard II is going up for auction in England. The late 14th century piece is similar to one housed in the British Museum.

The quadrant was found in a shed in Austrailia and probably unearthed by a ancestor of the current powner. The quadrant is expected to fetch UK£150,000 ($240,000 USD).  The quadrant could tell the approximate time of day. [photo]