Long-term GBPUSD chart
By PolarPacific (July 2004)

Some levels of interest

2.00: last peak (prior to EMS crisis)
2.20: current value of logscale trendline joining major tops in 1864 and 1934
2.40: geometric average between 20th century monthly closing High at 5.28 and monthly closing Low at 1.09.
2.80: peak during post-WWII stability and neckline of inverted H&S formation

Allowing for the Bretton Woods regime, during the 50-year span from 1951-2001 there were altogether 7 major Lows -- all spaced virtually 100 months apart. These 7 actual Lows plus the next 2 projected ones in OCT2009 and FEB2018 are indicated by the red boxes.

Other long-term charts:
USD Trade-weighted index
Yen charts
AUDUSD chart
NZD trade-weighted index