The Tektronix 604 is an X-Y monitor with a 6½" CRT and 2 MHz bandwidth. It has differential X/Y/Z inputs with BNC connectors. Deflection is adjustable from 50—250 mV/Div, or up to 1.25 V/Div with an internal 5:1 attenuator.
The 603 sister model is similar but with a storage tube.
CRT 154-0633-05, 154-0633-10