Red, this depends on what type of magneto you have, and if the position of the advance cable input is on the forward or aft side of the magneto.
If this sounds confusing, you can check with the follwing method:
Remove the cover of the contact breaker, and determine in which direction the contact breaker rotates when the engine is turned in the normal direction of rotation.
Take a look at the backplate (this is situated behind the contactbreaker). This backplate has a small ramp that opens and closes the conactbreaker.
Operate the manual
If the ramp on the backplate moves towards the contactbreaker(seen from rotational direction of the c/b) the ignition is advanced.
If the backplate moves away from the c/b, the ignition is retarded.
In other words: if the backplate is moved in the opposite rotary direction as as the contact breaker, the ignition is advanced, and of course, if the backplate is turned into the same direction as the contact breaker, the ignition is retarded.
Use the fully advanced position for adjustment of the ignition timing.
It may sound a bit complicated, but if you take a close look at the magneto / contact breaker, it will become clear.
Hope this helps.