Carl Plath, Hamburg, "gtl", Type SKS-3D, Movement No. 5550, Unit No. 616-42A, 370 mm, circa 1945
A rare pneumatically driven gyro sextant of the German naval observatory in Hamburg, for use on a submarine; in its original wooden box
Case: black lacquered.
The instruction sheet is pasted inside the box, two original spare light bulbs are still available.