This is an original brass Sestrel lifeboat compass. The compass is liquid filled and is functional.  This Sestrel lifeboat compass measures about 9 inches tall. The base is about 8 inches in diameter.   The sestrel lifeboat compass weighs just under 6 1/2 pounds.  The compass card and housing is marked with the makers’ name “Sestrel” and also “Made in England”.  The compass itself gimbals freely inside the housing, which shows a bit of weathering.