More like the VT-05. The VT-52 came a few years later. But yeah, the VT-420 is way later.

Fun fact: The VT-52 didn't have a loudspeaker for the bell sound. Instead, it had a electromechanical relay which was set up to self-oscillate.

"Typing a character produced a noise by activating a relay. The relay was also used as a buzzer to sound the bell character, producing a sound that "has been compared to the sound of a '52 Chevy stripping its gears."

YouTube has the sound: https://www.youtube.com/watch?v=bAafRXddfxc