I believe it has to do with replacement issues....
So from 2006 onwards certian prefixes within certain serial ranges are used as replacements...
However prior to that it was certain prefixes were exclusively used for replacements and prior to that an asterix was used...
So from 2006 onwards certian prefixes within certain serial ranges are used as replacements...
However prior to that it was certain prefixes were exclusively used for replacements and prior to that an asterix was used...






















