Airspeed Adjustment Module for Course Setting Bomb Sight RAF
We have been advised that this item is an Airspeed Adjustment Module for use with early versions of the British RAF's Course Setting Bomb Sight (aka Wimperis). We do not have corroborating information. A photo of such a sight is in the photo gallery, indicating where this module would be installed, however, what is pictured is not the exact module shown here.
Measures ~ 5 inches long and 4 inches wide. Made of metal.