Turn and Slip Indicator 2 Minute Turn, Type MD-4A, MIL-I-7627A
This Turn and Slip Indicator Type MD-4A, MS28041, MIL-I-7627A, 2 minute turn, was made by RC Allen. The case is open, and the internal mechanism can be removed to reveal the electrical gyroscope. Likely from the 1960s.
It is in experienced condition given its age. The dial markings are clear and the glass is intact. Measures 2.25inches diameter by ~5inches deep.