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The W727 is an all glass screened pentode that existed around 1960. To date the only data found is that from Keith Thrower and that is just the heater rating.

The GEC paper brand label indicating that this was sold for professional applications.

Thanks to Mark Mallison for sending the image.

The thin glass tube envelope is  mm in diameter and, excluding the B9A base pins, is  mm tall.

Reference: Data.