I did a search on "rebasing currency" and came across this article from 2001...I'm not thrilled about it.
Tuesday, 6 March, 2001, 13:37 GMT
Japan may drop zeros from yen
The 2,000 yen banknotes could be shrunk to 20 yen
Japan's ruling Liberal Democrat party is mulling rebasing its currency, according to national press reports.
The change would mean that a couple of zeros would be lopped of the end of the yen, making one unit worth a hundred times more.