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The 5703WA from Raytheon, is a post WWII experimental type.

Some other subminiature valves in the '57' range are clearly for military purposes (Type 5768 is listed as a 'rocket triode'! Probably designed for use in proximity fuses.).

One advantage of the very small size and weight is robustness to vibration and shock. Such a small valve would get very hot at the ratings indicated but it might not be required to operate for more than a few seconds.

The thin glass tube envelope is 9 mm in diameter and, excluding the base pins, is 38 mm tall.

References: Data-sheet.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.