Philips MW6-2
MW6-4 has flat faceplate
MG6-2 (green), MU6-2 (blue) MY6-2 (red)

mw6-2a.jpg (20050 bytes)
MW6-2 = 3NP4 = CV1737
 

This is a Philips 2" CRT with magnetic deflection. It was used for black and white projection television receivers back in 1950. The anode voltage is 25 kV and to prevent arcing there is a special shaped insulator for the anode connector.