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This large WWII cathode ray tube has a base and neck that are very similar to the VCR138 and VCR97 tubes of the period but a screen that is very much larger. It could have been made as a demonstration device so that several people could see it at one time or it could have been designed for television reception, we just don't know.

Hans-Thomas Schmidt has reported that the base is not B12D but a Philips 12 Pin side contact base. The attached PDF shows the shape of the base pins of the DG16-2 that also uses the Philips base.

The end window envelope is 320 mm in diameter with the neck at 60 mm diameter, and excluding the base pins, is 620 mm long.

References: Observation.