"Standard" pre-encoded designPage last modified/checked: Wednesday, 12 March 2003The first known pre-encoded issues were designated "M". The earliest issues found (at Burwood station) dated from October 1996. The "M A" designator appeared during 1997. Around July 1998, the "M B" designator issues started appearing and it wasn't until September 1999 that the first of the "M C" series were seen.
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