This is a Cassens & Plath Overhead Gyro Compass that is a 160 Variation and Type 21 steering compass with illuminated 24 volt lighting. The overhead compass is available as a direct view or with mirror reading (mirror & lens). This was removed from a drill ship and was a spare that was kept on ship in the event the mounted compass failed this new compass could be deploied. The custom wood case indicates a date of 2007-4, this is old new inventory that’s has not been used or installed yet and is in like new condition.