I can answer your question..
Just baton hour markers were predominant dials from the older reference 1500 models with plastic crystals {as in your picture}.
Now the newer sapphire Air Kings dials as you stated did come with the 3-6-9 font set up. But the transitional fast beat Rolex 3000 caliber with plastic crystals did in the early stages have the baton hour markers on the dial as well.
Arthur