The 6EJ7 is sharp cut-off amplifier pentode for TV IF circuits. The mutual conductance is given as 15 mA/v.
The envelope has the words Made in Germany. This probably refers to the then West Germany.
The RCA name and on the left can be the strap that joins the two halves of the anode together.
Through the outer screen can be seen the anode join strap with the anode plates on the left and right. The open wound suppressor grid can be seen as can the close wound screen grid. The straight vertical line hides the frame grid construction of the control grid.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 54 mm tall.
Reference: Datasheet. Type 6EJ7 was first introduced in 1960.