A System 4 console is used to program the M505 computer.
Year of feature (shown above):
this system 4 machine is a leo3
Well spotted! I'll add a separate entry for the LEO 3.
I was a System 4 operator for many years, originally with English Electric Leo Marconi which became English Electric Computers which became ICL. I eventually became a freelance op and worked for many different companies on many different versions of System 4 machines starting with its predecessor, the RCA Spectra. I mention all this because, in all that time (12 years), I never saw (or heard of) a console with a VDU as shown in your picture - they all had teletext-style consoles. (The label above the keyboard looks authentic though).
The VDU shown looks like an early Cosser display,ICL used these as remote terminals in the mid to late 60s.The console control panel is Leo 3.the label looks like a paper copy of an English Electric one used in the mid 60s.