Hmm...that's a bit tricky. I suppose you have one of the older models (not the plastic ones), if so you can use Sunny 16 to have an estimate. It is however not that easy to tell if it is precise, as the meter reading in the viewfinder shows both shutter speed and aperture on the same line, but you should be able to get a usable estimate.
If you are not familiar with sunny 16, it can be found here: http://en.wikipedia.org/wiki/Sunny_16_rule
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