AC50 serial number 1749
Last third of 1964
The amp looks to have its original mains cable with "old colour" wiring: green, red and black.
Click as ever on the thumbnails for larger images.
On the Welwyn resistor the date code "VG" = July 1964.
The date codes on two of the blue Hunts capacitors are: "HAT" = 29th week of 1964.
Mustard cap. date codes: "B/64" = second quarter of 1964.
Date code on the pot: "HL" = August 1964.