Quote from Businessman:
I dont not have intra day data but my end of day data says:
Firday Sep 20 1985: close 238.15
Monday Sep 23 1985: close 225.78
Thats over 1200 pips.
I read that 800 of that 1200 was on the open.
The YEN was trading at twice the value back in 1985 so translated today a similar percentage move would be 400 pips. Still huge.
I think you have bad data there