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The back of the display:



Numbers on the circuit board:



The RMS module, with a clue as to when this might have been built:



The back panel with transformer and high voltage resistor:



The? transformer, with another clue as to when this was built:




The back panel with serial number and technician's name scratched? into it:



I emailed all your responses to my friend who owns this piece, and he was delighted to hear your comments.? If seeing these pictures brings anything else to mind, I'm sure my friend would like to hear any further comments.