Another Interesting Pattern

Could this be a Double-Top? It doesn't meet some of the specific criteria for trading stock chart patterns, but I'm finding the looks of this pattern on a long-term S&P 500 Chart pretty interesting...
This pattern is validated when it breaks the low of the trough between the two peaks, which is around 800. The anticipated target would then be the difference between the height of the peaks and the low of the trough (so, roughly speaking 1600 at the peak - 800 at the trough = 800). Subtract that number from the breakout point (800) and this would bring our target to *0*, as in ZERO? Geez, let's hope not! But if this pattern was to play out, it could take about 7 1/2 years to do so - the time from the first peak to the second. It's times like this when I hope technical analysis really isn't a self-fulfilling prophecy.