It is almost certain that this CRT is a M01JVV47WB but Matsushita made a wide variety of similar viewfinder CRT's with slight variations of dimensions etc.
These are truly beautiful examples of incredible precision engineering & manufacture. The screen is actually circular, of 16 mm diameter. The heater voltage is 2.5 volts and EHT approximately 900 volts.
This tiny television picture tube produced monochrome images for a domestic video camera/recorder eyepiece. The screen was viewed through 90 degrees by means of a metal plate mirror and a magnifying lens.
The tube is still attached to its driver board and was working before the camera ended its life.
Jeremy Skertchly has pointed out that the designation ELY07V552A actually relates to the deflection yoke as well as supplying the details of the tube.
Jeremy writes: you can get a better look at the tube by carefully removing the screen mask assembly by undoing the two little Philips screws and also removing the deflection coil assembly. Then carefully undoing the knurled locking ring and removing it. It will probably have a'drip' of glue or locking fluid on it to stop it loosening, 'crack' this with a little screw driver if the ring wont turn. Then pry the four 'grip' tabs away from the tube neck very slightly to allow the coil assembly to slide off the tube. Dont bend them back too much or they will break off. You may also want to remove the strip of tape/plaster around the tube neck to see the gun assembly and really appreciate the beauty of this tube.
These tubes could be replaced and the original deflection coil assembly be retained. Certain types had the coils actually wound around a narrow section of the tube neck and the tube and coils were treated as a complete assembly. They have been largely superceded by solid state LCD devices. There were a great variety of these beautiful tiny tubes including rectangular screen ones which are amongst the worlds smallest CRTs.
They have a variety of uses as well as viewfinders including 'head up' displays and hand held video communicators. One system used such CRT's for a door entry system. They used a circular tube of about 14 mm screen diameter so you could see who you were talking to. The image was limited to a head and shoulders view. As portable radio communicators, they were used, it is believed, by various police forces.
The end window is 12 x 8 mm. The envelope is 10 mm in diameter and, excluding the base pins, is 67 mm long.
Reference: Jeremy Skertchly.
Updated April 08, 2013.