Found this interesting article in October 1964 issue of Modern Motor. They were made by Cheapa Glass Company in Camperdown, NSW and cost 30 pounds. The article talks about NSW Water Board fleet drivers complaining of heat exhaustion in their sliding window Morris 850's and this was the result. The hinged ventilation panel comes from a Holden. The original door lock mechanism is retained which means the trailing three inches of the window is fixed. This is turned into a positive feature by the author - "... it acts as a draft excluder for back seat passengers". It took a day to fit and 160 had been made at the time of writing.
I wonder if any still exist? Has anyone seen one in real life?
