The 1619 is a beam tetrode RF power valve that was introduced in 1938. The 2.5 volt filament suggests a quick heating type for mobile transmitters.
The box indicates that the valve was made for the Canadian Marconi company but the valve is labeled as made by RCA. The box carries the RVC logo of the Canadian Radio Valve Company, a business originally jointly owned by Marconi Canada and Canadian General Electric.
The octal base the evacuation stem is housed within the spigot.
The wide metal tube envelope is 32 mm in diameter, and excluding the IO base pins is 92 mm tall.
Reference: Datasheet. Type 1619 was first introduced in 1938.