Not entirely true...sorry.
MA reduced the level requirement on many old school weapons.
So look at a few weapons in auction to get an idea. If you're level 60.5 the hit ability won't say 6.5 it should be a little higher like 7.8
I don't know the 'new' ratios though, although I'm sure it's the same rules on any 'old' weapon based on Damage and Hit professional levels.
Also the full weapon damage potential limits kick in much quicker (i.e. 20.00-55.00/20.00-55.00) on these old school weapons.
Although on limited weapons when you reach the professional level requirement you still may need additional levels above that to fully max the weapon damage potential, even if you're 10/10 on hit and damage ability.
Rick