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The euro fell 0.4 percent to $1.1728, past option barriers at $1.1750, to its lowest level in nine years and below $1.1747, the level it started trading in Sydney on Jan. 4, 1999, according to Reuters data.
The euro was officially launched on Jan 1, 1999 and began trading on Jan 4. An adviser to Europe's top court said on Wednesday that an earlier, unused, ECB bond-buying programme was legal under some conditions.
That was seen as leaving the door open for the bank to embark on outright money-printing for the first time.