In my memento's I have a flight plan for a training flight I undertook as part of my training for my private pilot's licence on 5/9/1964.
The route was Bankstown - Canberra - Bankstown. The document was called a "FLIGHT PLAN B".
At the bottom of the document is an Operational Approval box. It contains the statement (Required for Flights in Controlled Airspace).
Should operational approval be required it has space for "Terms", "Plan approved.........GMT", Plan void.........GMT". "Signature of the Air Trafic Controller", and if IFR, whether 1 or 2 pilots.
On my plan, in the "Terms" box it is rubber stamped "Operational Control Not Required" and hand written are the words "Notams Wx Call CB TWR at North Tip Lake George" it is initialled by the officer in the space for the signature of the Air Traffic Controller.
The Flight Levels on the plan were notated BCTA or B50 which I presume were the correct notations at that time for "Below Controlled Area" and "Below 5000 feet".
The flight was conducted in a C172.