According to the AFL website's list of rule changes:
https://www.afl.com.au/about-afl/history/rule-changes
Before then I think the only markings on the ground were the goal squares, centre circle, and centre square. I don't remember seeing any 25m arcs painted on the ground in the video footage I've seen of those old games.
Maybe you should be addressing that question to some of the board's senior citizens (of whom there seem to be many, if the Generations thread is anything to go by.
NO 25 metre arcs drawn. 50 metre arc was the only one introduced.