It's generally regarded as Australian, but a number of sources suggest that
it originated from an English (east midlands) dialect:
http://www.etymonline.com/index.php?term=dinkum
http://en.wikipedia.org/wiki/Dinkum#A_to_D
....
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Regards,
Pat Garard
Melbourne, Australia
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wrote in message ...
Suzanne (or anyone else): Have you ever come across the word 'dinkum' in the
context of Word/editing/book production? (Not the Australian term 'fair
dinkum')