Here are Celestion H30 variations that are currently sold to my knowledge. The H30 Heritage 75hz and the Heritage 55hz models both made in UK, The H75 Creamback 75hz (higher powered H30) Made in UK, and then the Anniversary H30's made in China.
I bought the Anniversary H30's thinking they would sound like my old 79 Blackback H-30's and they were really harsh out of the box, highs were really harsh things only became acceptable after they were broken in but to my ears still didn't sound like my original H-30's, that was a few years ago. I'm in the market again for more H-30's and this time it's either the Heritage H-30's or the Creamback H75 for me this time. I know some guys love the anniversary but this wasn't my experience at the time, I was really disappointed, and they are not that much cheaper really.
It seems the highs are tamed a bit with the creamback H75's but the lows are nice and tight so I am currently leaning towards picking up some H75's to mix with two G65's, pulling two greenbacks out. There doesn't seem to be alot of negative press on the H-75's which is good.